Adding upstream version 0.19.0.upstream/0.19.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 2201 insertions, 0 deletions

diff --git a/src/python/Makefile.am b/src/python/Makefile.am
new file mode 100644
index 0000000..1dc98c4
--- /dev/null
+++ b/src/python/Makefile.am
@@ -0,0 +1,35 @@
+if BUILD_PYTHON
+
+EXTRA_DIST = test-env.sh
+
+pyexec_LTLIBRARIES = ixion.la
+ixion_la_SOURCES = \
+	document.hpp \
+	document.cpp \
+	global.hpp \
+	global.cpp \
+	python.cpp \
+	sheet.hpp \
+	sheet.cpp
+
+ixion_la_LDFLAGS = -module -avoid-version -export-symbols-regex PyInit_ixion
+ixion_la_CPPFLAGS = -I$(top_srcdir)/include $(PYTHON_CFLAGS) $(MDDS_CFLAGS)
+ixion_la_LIBADD = \
+	../libixion/libixion-@IXION_API_VERSION@.la \
+	$(PYTHON_LIBS)
+
+if OSX
+
+TESTS = ../../bin/run-python-test-osx.sh
+
+else
+
+AM_TESTS_ENVIRONMENT = . $(srcdir)/test-env.sh;
+
+TESTS = \
+	../../test/python/document.py \
+	../../test/python/module.py
+
+endif
+
+endif
diff --git a/src/python/Makefile.in b/src/python/Makefile.in
new file mode 100644
index 0000000..11b660a
--- /dev/null
+++ b/src/python/Makefile.in
@@ -0,0 +1,1145 @@
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+	if test `expr $$fail + $$xpass + $$error` -eq 0; then \
+	  success=true; \
+	else \
+	  success=false; \
+	fi; \
+	br='==================='; br=$$br$$br$$br$$br; \
+	result_count () \
+	{ \
+	    if test x"$$1" = x"--maybe-color"; then \
+	      maybe_colorize=yes; \
+	    elif test x"$$1" = x"--no-color"; then \
+	      maybe_colorize=no; \
+	    else \
+	      echo "$@: invalid 'result_count' usage" >&2; exit 4; \
+	    fi; \
+	    shift; \
+	    desc=$$1 count=$$2; \
+	    if test $$maybe_colorize = yes && test $$count -gt 0; then \
+	      color_start=$$3 color_end=$$std; \
+	    else \
+	      color_start= color_end=; \
+	    fi; \
+	    echo "$${color_start}# $$desc $$count$${color_end}"; \
+	}; \
+	create_testsuite_report () \
+	{ \
+	  result_count $$1 "TOTAL:" $$all   "$$brg"; \
+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
+	  result_count $$1 "SKIP: " $$skip  "$$blu"; \
+	  result_count $$1 "XFAIL:" $$xfail "$$lgn"; \
+	  result_count $$1 "FAIL: " $$fail  "$$red"; \
+	  result_count $$1 "XPASS:" $$xpass "$$red"; \
+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
+	  echo "$(PACKAGE_STRING): $(subdir)/$(TEST_SUITE_LOG)" |	\
+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
+	  echo ".. contents:: :depth: 2";				\
+	  echo;								\
+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
+	} >$(TEST_SUITE_LOG).tmp || exit 1;				\
+	mv $(TEST_SUITE_LOG).tmp $(TEST_SUITE_LOG);			\
+	if $$success; then						\
+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
+	fi;								\
+	echo "$${col}$$br$${std}"; 					\
+	echo "$${col}Testsuite summary"$(AM_TESTSUITE_SUMMARY_HEADER)"$${std}";	\
+	echo "$${col}$$br$${std}"; 					\
+	create_testsuite_report --maybe-color;				\
+	echo "$$col$$br$$std";						\
+	if $$success; then :; else					\
+	  echo "$${col}See $(subdir)/$(TEST_SUITE_LOG)$${std}";		\
+	  if test -n "$(PACKAGE_BUGREPORT)"; then			\
+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
+	  fi;								\
+	  echo "$$col$$br$$std";					\
+	fi;								\
+	$$success || exit 1
+
+check-TESTS: 
+	@list='$(RECHECK_LOGS)';           test -z "$$list" || rm -f $$list
+	@list='$(RECHECK_LOGS:.log=.trs)'; test -z "$$list" || rm -f $$list
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+	@set +e; $(am__set_TESTS_bases); \
+	log_list=`for i in $$bases; do echo $$i.log; done`; \
+	trs_list=`for i in $$bases; do echo $$i.trs; done`; \
+	log_list=`echo $$log_list`; trs_list=`echo $$trs_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) TEST_LOGS="$$log_list"; \
+	exit $$?;
+recheck: all 
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+	@set +e; $(am__set_TESTS_bases); \
+	bases=`for i in $$bases; do echo $$i; done \
+	         | $(am__list_recheck_tests)` || exit 1; \
+	log_list=`for i in $$bases; do echo $$i.log; done`; \
+	log_list=`echo $$log_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) \
+	        am__force_recheck=am--force-recheck \
+	        TEST_LOGS="$$log_list"; \
+	exit $$?
+../../test/python/document.py.log: ../../test/python/document.py
+	@p='../../test/python/document.py'; \
+	b='../../test/python/document.py'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
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+	"$$tst" $(AM_TESTS_FD_REDIRECT)
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+	@p='../../test/python/module.py'; \
+	b='../../test/python/module.py'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
+../../bin/run-python-test-osx.sh.log: ../../bin/run-python-test-osx.sh
+	@p='../../bin/run-python-test-osx.sh'; \
+	b='../../bin/run-python-test-osx.sh'; \
+	$(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
+.test.log:
+	@p='$<'; \
+	$(am__set_b); \
+	$(am__check_pre) $(TEST_LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_TEST_LOG_DRIVER_FLAGS) $(TEST_LOG_DRIVER_FLAGS) -- $(TEST_LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
+@am__EXEEXT_TRUE@.test$(EXEEXT).log:
+@am__EXEEXT_TRUE@	@p='$<'; \
+@am__EXEEXT_TRUE@	$(am__set_b); \
+@am__EXEEXT_TRUE@	$(am__check_pre) $(TEST_LOG_DRIVER) --test-name "$$f" \
+@am__EXEEXT_TRUE@	--log-file $$b.log --trs-file $$b.trs \
+@am__EXEEXT_TRUE@	$(am__common_driver_flags) $(AM_TEST_LOG_DRIVER_FLAGS) $(TEST_LOG_DRIVER_FLAGS) -- $(TEST_LOG_COMPILE) \
+@am__EXEEXT_TRUE@	"$$tst" $(AM_TESTS_FD_REDIRECT)
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
+all-am: Makefile $(LTLIBRARIES)
+installdirs:
+	for dir in "$(DESTDIR)$(pyexecdir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-pyexecLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ixion_la-document.Plo
+	-rm -f ./$(DEPDIR)/ixion_la-global.Plo
+	-rm -f ./$(DEPDIR)/ixion_la-python.Plo
+	-rm -f ./$(DEPDIR)/ixion_la-sheet.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+install-html: install-html-am
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+install-html-am:
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+install-info-am:
+
+install-man:
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+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/ixion_la-document.Plo
+	-rm -f ./$(DEPDIR)/ixion_la-global.Plo
+	-rm -f ./$(DEPDIR)/ixion_la-python.Plo
+	-rm -f ./$(DEPDIR)/ixion_la-sheet.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-pyexecLTLIBRARIES
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am clean clean-generic clean-libtool \
+	clean-pyexecLTLIBRARIES cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-pyexecLTLIBRARIES install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am \
+	uninstall-pyexecLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/python/document.cpp b/src/python/document.cpp
new file mode 100644
index 0000000..48d1073
--- /dev/null
+++ b/src/python/document.cpp
@@ -0,0 +1,313 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "document.hpp"
+#include "sheet.hpp"
+#include "global.hpp"
+
+#include "ixion/formula.hpp"
+#include "ixion/exceptions.hpp"
+#include "ixion/config.hpp"
+
+#include <iostream>
+#include <vector>
+#include <algorithm>
+#include <sstream>
+
+using namespace std;
+
+namespace ixion { namespace python {
+
+namespace {
+
+/** non-python part of the document data */
+struct document_data
+{
+    document_global m_global;
+    vector<PyObject*> m_sheets;
+
+    ~document_data();
+};
+
+struct free_pyobj
+{
+    void operator() (PyObject* p)
+    {
+        Py_XDECREF(p);
+    }
+};
+
+document_data::~document_data()
+{
+    for_each(m_sheets.begin(), m_sheets.end(), free_pyobj());
+}
+
+/**
+ * Python Document object.
+ */
+struct pyobj_document
+{
+    PyObject_HEAD
+
+    document_data* m_data;
+};
+
+void document_dealloc(pyobj_document* self)
+{
+    delete self->m_data;
+    Py_TYPE(self)->tp_free(reinterpret_cast<PyObject*>(self));
+}
+
+PyObject* document_new(PyTypeObject* type, PyObject* /*args*/, PyObject* /*kwargs*/)
+{
+    pyobj_document* self = (pyobj_document*)type->tp_alloc(type, 0);
+    self->m_data = new document_data;
+    return reinterpret_cast<PyObject*>(self);
+}
+
+int document_init(pyobj_document* self, PyObject* /*args*/, PyObject* /*kwargs*/)
+{
+    return 0;
+}
+
+PyObject* document_append_sheet(pyobj_document* self, PyObject* args)
+{
+    char* sheet_name = nullptr;
+    if (!PyArg_ParseTuple(args, "s", &sheet_name))
+    {
+        PyErr_SetString(PyExc_TypeError, "The method must be given a sheet name string");
+        return nullptr;
+    }
+
+    assert(sheet_name);
+
+    PyTypeObject* sheet_type = get_sheet_type();
+    if (!sheet_type)
+        return nullptr;
+
+    PyObject* obj_sheet = sheet_type->tp_new(sheet_type, args, 0);
+    if (!obj_sheet)
+    {
+        PyErr_SetString(PyExc_RuntimeError,
+            "Failed to allocate memory for the new sheet object.");
+        return nullptr;
+    }
+
+    sheet_type->tp_init(obj_sheet, args, 0);
+
+    // Pass model_context to the sheet object.
+    sheet_data* sd = get_sheet_data(obj_sheet);
+    sd->m_global = &self->m_data->m_global;
+    ixion::model_context& cxt = sd->m_global->m_cxt;
+    try
+    {
+        sd->m_sheet_index = cxt.append_sheet(sheet_name);
+    }
+    catch (const model_context_error& e)
+    {
+        // Most likely the sheet name already exists in this document.
+        Py_XDECREF(obj_sheet);
+        switch (e.get_error_type())
+        {
+            case model_context_error::sheet_name_conflict:
+                PyErr_SetString(get_python_document_error(), e.what());
+            break;
+            default:
+                PyErr_SetString(get_python_document_error(),
+                    "Sheet insertion failed for unknown reason.");
+        }
+        return nullptr;
+    }
+    catch (const general_error& e)
+    {
+        Py_XDECREF(obj_sheet);
+        ostringstream os;
+        os << "Sheet insertion failed and the reason is '" << e.what() << "'";
+        PyErr_SetString(get_python_document_error(), os.str().c_str());
+        return nullptr;
+    }
+
+    // Append this sheet instance to the document.
+    Py_INCREF(obj_sheet);
+    self->m_data->m_sheets.push_back(obj_sheet);
+
+    return obj_sheet;
+}
+
+const char* doc_document_calculate =
+"Document.calculate([threads])\n"
+"\n"
+"(Re-)calculate all modified formula cells in the document.\n"
+"\n"
+"Keyword arguments:\n"
+"\n"
+"threads -- number of threads to use besides the main thread, or 0 if all\n"
+"           calculations are to be performed on the main thread. (default 0)\n"
+;
+
+PyObject* document_calculate(pyobj_document* self, PyObject* args, PyObject* kwargs)
+{
+    static const char* kwlist[] = { "threads", nullptr };
+
+    long threads = 0;
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", const_cast<char**>(kwlist), &threads))
+    {
+        PyErr_SetString(PyExc_TypeError, "Failed to parse the arguments for Document.calculate()");
+        return nullptr;
+    }
+
+    document_global& dg = self->m_data->m_global;
+
+    // Query additional dirty formula cells and add them to the current set.
+    std::vector<abs_range_t> sorted = ixion::query_and_sort_dirty_cells(
+        dg.m_cxt, dg.m_modified_cells, &dg.m_dirty_formula_cells);
+    ixion::calculate_sorted_cells(dg.m_cxt, sorted, threads);
+
+    dg.m_modified_cells.clear();
+    dg.m_dirty_formula_cells.clear();
+
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+PyObject* document_get_sheet(pyobj_document* self, PyObject* arg)
+{
+    const vector<PyObject*>& sheets = self->m_data->m_sheets;
+    if (PyLong_Check(arg))
+    {
+        long index = PyLong_AsLong(arg);
+        if (index == -1 && PyErr_Occurred())
+            return nullptr;
+
+        if (index < 0 || static_cast<size_t>(index) >= sheets.size())
+        {
+            PyErr_SetString(PyExc_IndexError, "Out-of-bound sheet index");
+            return nullptr;
+        }
+
+        PyObject* sheet_obj = sheets[index];
+        Py_INCREF(sheet_obj);
+        return sheet_obj;
+    }
+
+    // Not a python int object.  See if it's a string object.
+    const char* name = PyUnicode_AsUTF8(arg);
+    if (!name)
+    {
+        PyErr_SetString(PyExc_TypeError,
+            "The 'arg' value must be either of type int or type str.");
+        return nullptr;
+    }
+
+    // Iterate through all sheets to find a match.
+    // TODO : Use string hash to speed up the lookup.
+    for (PyObject* sh : sheets)
+    {
+        PyObject* obj = get_sheet_name(sh);
+        if (!obj)
+            continue;
+
+        const char* this_name = PyUnicode_AsUTF8(obj);
+        if (!this_name)
+            continue;
+
+        if (!strcmp(name, this_name))
+        {
+            Py_INCREF(sh);
+            return sh;
+        }
+    }
+
+    ostringstream os;
+    os << "No sheet named '" << name << "' found";
+    PyErr_SetString(PyExc_IndexError, os.str().c_str());
+    return nullptr;
+}
+
+PyObject* document_getter_sheet_names(pyobj_document* self, void* closure)
+{
+    model_context& cxt = self->m_data->m_global.m_cxt;
+    const vector<PyObject*>& sheets = self->m_data->m_sheets;
+    size_t n = sheets.size();
+    PyObject* t = PyTuple_New(n);
+    for (size_t i = 0; i < n; ++i)
+    {
+        std::string name = cxt.get_sheet_name(i);
+        PyObject* o = PyUnicode_FromString(name.c_str());
+        PyTuple_SetItem(t, i, o);
+    }
+
+    return t;
+}
+
+PyMethodDef document_methods[] =
+{
+    { "append_sheet", (PyCFunction)document_append_sheet, METH_VARARGS, "append new sheet to the document" },
+    { "calculate", (PyCFunction)document_calculate, METH_VARARGS | METH_KEYWORDS, doc_document_calculate },
+    { "get_sheet", (PyCFunction)document_get_sheet, METH_O, "get a sheet object either by index or name" },
+    { nullptr }
+};
+
+PyGetSetDef document_getset[] =
+{
+    { "sheet_names", (getter)document_getter_sheet_names, (setter)nullptr, "A tuple of sheet names", nullptr },
+    { nullptr }
+};
+
+PyTypeObject document_type =
+{
+    PyVarObject_HEAD_INIT(nullptr, 0)
+    "ixion.Document",                         // tp_name
+    sizeof(pyobj_document),                         // tp_basicsize
+    0,                                        // tp_itemsize
+    (destructor)document_dealloc,             // tp_dealloc
+    0,                                        // tp_print
+    0,                                        // tp_getattr
+    0,                                        // tp_setattr
+    0,                                        // tp_compare
+    0,                                        // tp_repr
+    0,                                        // tp_as_number
+    0,                                        // tp_as_sequence
+    0,                                        // tp_as_mapping
+    0,                                        // tp_hash
+    0,                                        // tp_call
+    0,                                        // tp_str
+    0,                                        // tp_getattro
+    0,                                        // tp_setattro
+    0,                                        // tp_as_buffer
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, // tp_flags
+    "ixion document object",                  // tp_doc
+    0,		                                  // tp_traverse
+    0,		                                  // tp_clear
+    0,		                                  // tp_richcompare
+    0,		                                  // tp_weaklistoffset
+    0,		                                  // tp_iter
+    0,		                                  // tp_iternext
+    document_methods,                         // tp_methods
+    0,                                        // tp_members
+    document_getset,                          // tp_getset
+    0,                                        // tp_base
+    0,                                        // tp_dict
+    0,                                        // tp_descr_get
+    0,                                        // tp_descr_set
+    0,                                        // tp_dictoffset
+    (initproc)document_init,                  // tp_init
+    0,                                        // tp_alloc
+    document_new,                             // tp_new
+};
+
+}
+
+PyTypeObject* get_document_type()
+{
+    return &document_type;
+}
+
+}}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/src/python/document.hpp b/src/python/document.hpp
new file mode 100644
index 0000000..b024000
--- /dev/null
+++ b/src/python/document.hpp
@@ -0,0 +1,21 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_IXION_PYTHON_DOCUMENT_HPP
+#define INCLUDED_IXION_PYTHON_DOCUMENT_HPP
+
+#include <Python.h>
+
+namespace ixion { namespace python {
+
+PyTypeObject* get_document_type();
+
+}}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/src/python/global.cpp b/src/python/global.cpp
new file mode 100644
index 0000000..4d9a76b
--- /dev/null
+++ b/src/python/global.cpp
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "ixion/config.hpp"
+#include "global.hpp"
+
+namespace ixion { namespace python {
+
+document_global::document_global() :
+    m_cxt(),
+    m_resolver(ixion::formula_name_resolver::get(formula_name_resolver_t::excel_a1, &m_cxt))
+{
+}
+
+PyObject* get_python_document_error()
+{
+    static PyObject* p = PyErr_NewException(const_cast<char*>("ixion.DocumentError"), NULL, NULL);
+    return p;
+}
+
+PyObject* get_python_sheet_error()
+{
+    static PyObject* p = PyErr_NewException(const_cast<char*>("ixion.SheetError"), NULL, NULL);
+    return p;
+}
+
+PyObject* get_python_formula_error()
+{
+    static PyObject* p = PyErr_NewException(const_cast<char*>("ixion.FormulaError"), NULL, NULL);
+    return p;
+}
+
+}}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/src/python/global.hpp b/src/python/global.hpp
new file mode 100644
index 0000000..d0a917f
--- /dev/null
+++ b/src/python/global.hpp
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_IXION_PYTHON_GLOBAL_HPP
+#define INCLUDED_IXION_PYTHON_GLOBAL_HPP
+
+#include <Python.h>
+
+#include "ixion/model_context.hpp"
+#include "ixion/formula_name_resolver.hpp"
+#include "ixion/address.hpp"
+
+namespace ixion { namespace python {
+
+struct document_global
+{
+    model_context m_cxt;
+
+    /**
+     * positions of all modified cells (formula and non-formula cells) since
+     * last calculation.
+     */
+    abs_range_set_t m_modified_cells;
+
+    /** positions of all dirty formula cells since last calculation. */
+    abs_range_set_t m_dirty_formula_cells;
+
+    std::unique_ptr<formula_name_resolver> m_resolver;
+
+    document_global();
+};
+
+PyObject* get_python_document_error();
+PyObject* get_python_sheet_error();
+PyObject* get_python_formula_error();
+
+}}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/src/python/python.cpp b/src/python/python.cpp
new file mode 100644
index 0000000..1c8b5bf
--- /dev/null
+++ b/src/python/python.cpp
@@ -0,0 +1,174 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "document.hpp"
+#include "sheet.hpp"
+#include "global.hpp"
+
+#include "ixion/env.hpp"
+#include "ixion/info.hpp"
+
+#include <iostream>
+#include <string>
+
+#define IXION_DEBUG_PYTHON 0
+#define GETSTATE(m) ((struct module_state*)PyModule_GetState(m))
+
+using namespace std;
+
+namespace ixion { namespace python {
+
+namespace {
+
+#if IXION_DEBUG_PYTHON
+void print_args(PyObject* args)
+{
+    string args_str;
+    PyObject* repr = PyObject_Repr(args);
+    if (repr)
+    {
+        Py_INCREF(repr);
+        args_str = PyBytes_AsString(repr);
+        Py_DECREF(repr);
+    }
+    cout << args_str << "\n";
+}
+#endif
+
+PyObject* info(PyObject*, PyObject*)
+{
+    cout << "ixion version: "
+        << ixion::get_version_major() << '.'
+        << ixion::get_version_minor() << '.'
+        << ixion::get_version_micro() << endl;
+
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+PyObject* column_label(PyObject* /*module*/, PyObject* args, PyObject* kwargs)
+{
+    int start;
+    int stop;
+    int resolver_index = 1; // Excel A1 by default
+    static const char* kwlist[] = { "start", "stop", "resolver", nullptr };
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "ii|i", const_cast<char**>(kwlist), &start, &stop, &resolver_index))
+        return nullptr;
+
+    if (start >= stop)
+    {
+        PyErr_SetString(
+            PyExc_IndexError,
+            "Start position is larger or equal to the stop position.");
+        return nullptr;
+    }
+
+    if (start < 0)
+    {
+        PyErr_SetString(
+            PyExc_IndexError,
+            "Start position should be larger than or equal to 0.");
+        return nullptr;
+    }
+
+    auto resolver = formula_name_resolver::get(
+        static_cast<formula_name_resolver_t>(resolver_index), nullptr);
+    if (!resolver)
+    {
+        PyErr_SetString(
+            get_python_formula_error(), "Specified resolver type is invalid.");
+        return nullptr;
+    }
+
+    int size = stop - start;
+    PyObject* t = PyTuple_New(size);
+
+    for (int i = start; i < stop; ++i)
+    {
+        string s = resolver->get_column_name(i);
+        PyObject* o = PyUnicode_FromString(s.c_str());
+        PyTuple_SetItem(t, i-start, o);
+    }
+
+    return t;
+}
+
+PyMethodDef ixion_methods[] =
+{
+    { "info", (PyCFunction)info, METH_NOARGS, "Print ixion module information." },
+    { "column_label", (PyCFunction)column_label, METH_VARARGS | METH_KEYWORDS,
+      "Return a list of column label strings based on specified column range values." },
+    { nullptr, nullptr, 0, nullptr }
+};
+
+struct module_state
+{
+    PyObject* error;
+};
+
+int ixion_traverse(PyObject* m, visitproc visit, void* arg)
+{
+    Py_VISIT(GETSTATE(m)->error);
+    return 0;
+}
+
+int ixion_clear(PyObject* m)
+{
+    Py_CLEAR(GETSTATE(m)->error);
+    return 0;
+}
+
+}
+
+struct PyModuleDef moduledef =
+{
+    PyModuleDef_HEAD_INIT,
+    "ixion",
+    nullptr,
+    sizeof(struct module_state),
+    ixion_methods,
+    nullptr,
+    ixion_traverse,
+    ixion_clear,
+    nullptr
+};
+
+}}
+
+extern "C" {
+
+IXION_DLLPUBLIC PyObject* PyInit_ixion()
+{
+    PyTypeObject* doc_type = ixion::python::get_document_type();
+    if (PyType_Ready(doc_type) < 0)
+        return nullptr;
+
+    PyTypeObject* sheet_type = ixion::python::get_sheet_type();
+    if (PyType_Ready(sheet_type) < 0)
+        return nullptr;
+
+    PyObject* m = PyModule_Create(&ixion::python::moduledef);
+
+    Py_INCREF(doc_type);
+    PyModule_AddObject(m, "Document", reinterpret_cast<PyObject*>(doc_type));
+
+    Py_INCREF(sheet_type);
+    PyModule_AddObject(m, "Sheet", reinterpret_cast<PyObject*>(sheet_type));
+
+    PyModule_AddObject(
+        m, "DocumentError", ixion::python::get_python_document_error());
+    PyModule_AddObject(
+        m, "SheetError", ixion::python::get_python_sheet_error());
+    PyModule_AddObject(
+        m, "FormulaError", ixion::python::get_python_formula_error());
+
+    return m;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/src/python/sheet.cpp b/src/python/sheet.cpp
new file mode 100644
index 0000000..873004a
--- /dev/null
+++ b/src/python/sheet.cpp
@@ -0,0 +1,376 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "sheet.hpp"
+#include "global.hpp"
+
+#include <ixion/model_context.hpp>
+#include <ixion/formula_name_resolver.hpp>
+#include <ixion/formula.hpp>
+#include <ixion/cell.hpp>
+#include <ixion/exceptions.hpp>
+
+#include <structmember.h>
+
+#include <iostream>
+
+using namespace std;
+
+namespace ixion { namespace python {
+
+sheet_data::sheet_data() : m_global(nullptr), m_sheet_index(-1) {}
+
+namespace {
+
+struct sheet
+{
+    PyObject_HEAD
+    PyObject* name; // sheet name
+
+    sheet_data* m_data;
+};
+
+void sheet_dealloc(sheet* self)
+{
+    delete self->m_data;
+
+    Py_XDECREF(self->name);
+    Py_TYPE(self)->tp_free(reinterpret_cast<PyObject*>(self));
+}
+
+PyObject* sheet_new(PyTypeObject* type, PyObject* /*args*/, PyObject* /*kwargs*/)
+{
+    sheet* self = (sheet*)type->tp_alloc(type, 0);
+    if (!self)
+        return nullptr;
+
+    self->m_data = new sheet_data;
+
+    self->name = PyUnicode_FromString("");
+    if (!self->name)
+    {
+        Py_DECREF(self);
+        return nullptr;
+    }
+    return reinterpret_cast<PyObject*>(self);
+}
+
+int sheet_init(sheet* self, PyObject* args, PyObject* kwargs)
+{
+    PyObject* name = nullptr;
+    static const char* kwlist[] = { "name", nullptr };
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O", (char**)kwlist, &name))
+        return -1;
+
+    if (name)
+    {
+        PyObject* tmp = self->name;
+        Py_INCREF(name);
+        self->name = name;
+        Py_XDECREF(tmp);
+    }
+
+    return 0;
+}
+
+PyObject* sheet_set_numeric_cell(sheet* self, PyObject* args, PyObject* kwargs)
+{
+    int col = -1;
+    int row = -1;
+    double val = 0.0;
+
+    static const char* kwlist[] = { "row", "column", "value", nullptr };
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "iid", const_cast<char**>(kwlist), &row, &col, &val))
+        return nullptr;
+
+    sheet_data* sd = get_sheet_data(reinterpret_cast<PyObject*>(self));
+    if (!sd->m_global)
+    {
+        PyErr_SetString(get_python_sheet_error(),
+            "This Sheet object does not belong to a Document object.");
+        return nullptr;
+    }
+
+    ixion::model_context& cxt = sd->m_global->m_cxt;
+    ixion::abs_address_t pos(sd->m_sheet_index, row, col);
+    sd->m_global->m_modified_cells.insert(pos);
+    cxt.set_numeric_cell(pos, val);
+
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+PyObject* sheet_set_string_cell(sheet* self, PyObject* args, PyObject* kwargs)
+{
+    int col = -1;
+    int row = -1;
+    char* val = nullptr;
+
+    static const char* kwlist[] = { "row", "column", "value", nullptr };
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "iis", const_cast<char**>(kwlist), &row, &col, &val))
+        return nullptr;
+
+    sheet_data* sd = get_sheet_data(reinterpret_cast<PyObject*>(self));
+    if (!sd->m_global)
+    {
+        PyErr_SetString(get_python_sheet_error(),
+            "This Sheet object does not belong to a Document object.");
+        return nullptr;
+    }
+
+    ixion::model_context& cxt = sd->m_global->m_cxt;
+    ixion::abs_address_t pos(sd->m_sheet_index, row, col);
+    sd->m_global->m_modified_cells.insert(pos);
+    cxt.set_string_cell(pos, val);
+
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+PyObject* sheet_set_formula_cell(sheet* self, PyObject* args, PyObject* kwargs)
+{
+    int col = -1;
+    int row = -1;
+    char* formula = nullptr;
+
+    static const char* kwlist[] = { "row", "column", "value", nullptr };
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "iis", const_cast<char**>(kwlist), &row, &col, &formula))
+        return nullptr;
+
+    sheet_data* sd = get_sheet_data(reinterpret_cast<PyObject*>(self));
+    if (!sd->m_global)
+    {
+        PyErr_SetString(get_python_sheet_error(),
+            "This Sheet object does not belong to a Document object.");
+        return nullptr;
+    }
+
+    ixion::model_context& cxt = sd->m_global->m_cxt;
+
+    ixion::abs_address_t pos(sd->m_sheet_index, row, col);
+    sd->m_global->m_dirty_formula_cells.insert(pos);
+
+    ixion::formula_tokens_t tokens =
+        ixion::parse_formula_string(cxt, pos, *sd->m_global->m_resolver, formula);
+
+    auto ts = formula_tokens_store::create();
+    ts->get() = std::move(tokens);
+    cxt.set_formula_cell(pos, ts);
+
+    // Put this formula cell in a dependency chain.
+    ixion::register_formula_cell(cxt, pos);
+
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+PyObject* sheet_get_numeric_value(sheet* self, PyObject* args, PyObject* kwargs)
+{
+    int col = -1;
+    int row = -1;
+
+    static const char* kwlist[] = { "row", "column", nullptr };
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "ii", const_cast<char**>(kwlist), &row, &col))
+        return nullptr;
+
+    sheet_data* sd = get_sheet_data(reinterpret_cast<PyObject*>(self));
+    if (!sd->m_global)
+    {
+        PyErr_SetString(get_python_sheet_error(),
+            "This Sheet object does not belong to a Document object.");
+        return nullptr;
+    }
+
+    ixion::model_context& cxt = sd->m_global->m_cxt;
+    double val = 0.0;
+    try
+    {
+        val = cxt.get_numeric_value(ixion::abs_address_t(sd->m_sheet_index, row, col));
+    }
+    catch (const formula_error&)
+    {
+        PyErr_SetString(PyExc_TypeError, "The formula cell has yet to be calculated");
+        return nullptr;
+    }
+
+    return PyFloat_FromDouble(val);
+}
+
+PyObject* sheet_get_string_value(sheet* self, PyObject* args, PyObject* kwargs)
+{
+    int col = -1;
+    int row = -1;
+
+    static const char* kwlist[] = { "row", "column", nullptr };
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "ii", const_cast<char**>(kwlist), &row, &col))
+        return nullptr;
+
+    sheet_data* sd = get_sheet_data(reinterpret_cast<PyObject*>(self));
+    if (!sd->m_global)
+    {
+        PyErr_SetString(get_python_sheet_error(),
+            "This Sheet object does not belong to a Document object.");
+        return nullptr;
+    }
+
+    ixion::model_context& cxt = sd->m_global->m_cxt;
+    std::string_view s = cxt.get_string_value(ixion::abs_address_t(sd->m_sheet_index, row, col));
+    if (s.empty())
+        return PyUnicode_FromStringAndSize(nullptr, 0);
+
+    return PyUnicode_FromStringAndSize(s.data(), s.size());
+}
+
+PyObject* sheet_get_formula_expression(sheet* self, PyObject* args, PyObject* kwargs)
+{
+    int col = -1;
+    int row = -1;
+
+    static const char* kwlist[] = { "row", "column", nullptr };
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "ii", const_cast<char**>(kwlist), &row, &col))
+        return nullptr;
+
+    sheet_data* sd = get_sheet_data(reinterpret_cast<PyObject*>(self));
+    if (!sd->m_global)
+    {
+        PyErr_SetString(get_python_sheet_error(),
+            "This Sheet object does not belong to a Document object.");
+        return nullptr;
+    }
+
+    ixion::model_context& cxt = sd->m_global->m_cxt;
+    ixion::abs_address_t pos(sd->m_sheet_index, row, col);
+    const ixion::formula_cell* fc = cxt.get_formula_cell(pos);
+
+    if (!fc)
+    {
+        PyErr_SetString(get_python_sheet_error(), "No formula cell at specified position.");
+        return nullptr;
+    }
+
+    const ixion::formula_tokens_t& ft = fc->get_tokens()->get();
+
+    string str = ixion::print_formula_tokens(cxt, pos, *sd->m_global->m_resolver, ft);
+    if (str.empty())
+        return PyUnicode_FromString("");
+
+    return PyUnicode_FromStringAndSize(str.data(), str.size());
+}
+
+PyObject* sheet_erase_cell(sheet* self, PyObject* args, PyObject* kwargs)
+{
+    PyErr_SetString(PyExc_RuntimeError, "erase_cell() method has been deprecated. Please use empty_cell() instead.");
+    return nullptr;
+}
+
+PyObject* sheet_empty_cell(sheet* self, PyObject* args, PyObject* kwargs)
+{
+    int col = -1;
+    int row = -1;
+
+    static const char* kwlist[] = { "row", "column", nullptr };
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "ii", const_cast<char**>(kwlist), &row, &col))
+        return nullptr;
+
+    sheet_data* sd = get_sheet_data(reinterpret_cast<PyObject*>(self));
+    if (!sd->m_global)
+    {
+        PyErr_SetString(get_python_sheet_error(),
+            "This Sheet object does not belong to a Document object.");
+        return nullptr;
+    }
+
+    ixion::model_context& cxt = sd->m_global->m_cxt;
+    abs_address_t pos(sd->m_sheet_index, row, col);
+    sd->m_global->m_modified_cells.insert(pos);
+    cxt.empty_cell(pos);
+
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+PyMethodDef sheet_methods[] =
+{
+    { "set_numeric_cell",  (PyCFunction)sheet_set_numeric_cell,  METH_VARARGS | METH_KEYWORDS, "set numeric value to specified cell" },
+    { "set_formula_cell",  (PyCFunction)sheet_set_formula_cell,  METH_VARARGS | METH_KEYWORDS, "set formula to specified cell" },
+    { "set_string_cell",   (PyCFunction)sheet_set_string_cell,   METH_VARARGS | METH_KEYWORDS, "set string to specified cell" },
+    { "get_numeric_value", (PyCFunction)sheet_get_numeric_value, METH_VARARGS | METH_KEYWORDS, "get numeric value from specified cell" },
+    { "get_string_value",  (PyCFunction)sheet_get_string_value,  METH_VARARGS | METH_KEYWORDS, "get string value from specified cell" },
+    { "get_formula_expression", (PyCFunction)sheet_get_formula_expression, METH_VARARGS | METH_KEYWORDS, "get formula expression string from specified cell position" },
+    { "empty_cell", (PyCFunction)sheet_empty_cell, METH_VARARGS | METH_KEYWORDS, "empty cell at specified position" },
+    { "erase_cell", (PyCFunction)sheet_erase_cell, METH_VARARGS | METH_KEYWORDS, "erase cell at specified position" },
+    { nullptr }
+};
+
+PyMemberDef sheet_members[] =
+{
+    { (char*)"name", T_OBJECT_EX, offsetof(sheet, name), READONLY, (char*)"sheet name" },
+    { nullptr }
+};
+
+PyTypeObject sheet_type =
+{
+    PyVarObject_HEAD_INIT(nullptr, 0)
+    "ixion.Sheet",                            // tp_name
+    sizeof(sheet),                            // tp_basicsize
+    0,                                        // tp_itemsize
+    (destructor)sheet_dealloc,                // tp_dealloc
+    0,                                        // tp_print
+    0,                                        // tp_getattr
+    0,                                        // tp_setattr
+    0,                                        // tp_compare
+    0,                                        // tp_repr
+    0,                                        // tp_as_number
+    0,                                        // tp_as_sequence
+    0,                                        // tp_as_mapping
+    0,                                        // tp_hash
+    0,                                        // tp_call
+    0,                                        // tp_str
+    0,                                        // tp_getattro
+    0,                                        // tp_setattro
+    0,                                        // tp_as_buffer
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, // tp_flags
+    "ixion sheet object",                     // tp_doc
+    0,		                                  // tp_traverse
+    0,		                                  // tp_clear
+    0,		                                  // tp_richcompare
+    0,		                                  // tp_weaklistoffset
+    0,		                                  // tp_iter
+    0,		                                  // tp_iternext
+    sheet_methods,                            // tp_methods
+    sheet_members,                            // tp_members
+    0,                                        // tp_getset
+    0,                                        // tp_base
+    0,                                        // tp_dict
+    0,                                        // tp_descr_get
+    0,                                        // tp_descr_set
+    0,                                        // tp_dictoffset
+    (initproc)sheet_init,                     // tp_init
+    0,                                        // tp_alloc
+    sheet_new,                                // tp_new
+};
+
+}
+
+PyTypeObject* get_sheet_type()
+{
+    return &sheet_type;
+}
+
+sheet_data* get_sheet_data(PyObject* obj)
+{
+    return reinterpret_cast<sheet*>(obj)->m_data;
+}
+
+PyObject* get_sheet_name(PyObject* obj)
+{
+    return reinterpret_cast<sheet*>(obj)->name;
+}
+
+}}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/src/python/sheet.hpp b/src/python/sheet.hpp
new file mode 100644
index 0000000..e85596e
--- /dev/null
+++ b/src/python/sheet.hpp
@@ -0,0 +1,44 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_IXION_PYTHON_SHEET_HPP
+#define INCLUDED_IXION_PYTHON_SHEET_HPP
+
+#include <Python.h>
+
+#include "ixion/types.hpp"
+
+namespace ixion { namespace python {
+
+struct document_global;
+
+struct sheet_data
+{
+    document_global* m_global;
+    ixion::sheet_t m_sheet_index;
+
+    sheet_data();
+};
+
+PyTypeObject* get_sheet_type();
+
+sheet_data* get_sheet_data(PyObject* obj);
+
+/**
+ * Get the sheet name of a python sheet object.
+ *
+ * @param obj python sheet object.
+ *
+ * @return python string object storing the sheet name.
+ */
+PyObject* get_sheet_name(PyObject* obj);
+
+}}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/src/python/test-env.sh b/src/python/test-env.sh
new file mode 100644
index 0000000..fc3f6cb
--- /dev/null
+++ b/src/python/test-env.sh
@@ -0,0 +1,9 @@
+
+PYTHONPATH=.libs:$PYTHONPATH
+
+# Ensure that the libixion shared library built as part of the current build
+# is discovered first.
+LD_LIBRARY_PATH=../libixion/.libs:$LD_LIBRARY_PATH
+
+export PYTHONPATH LD_LIBRARY_PATH
+