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diff --git a/src/boost/libs/python/test/boost_shared_ptr.py b/src/boost/libs/python/test/boost_shared_ptr.py
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+# Copyright David Abrahams 2004. Distributed under the Boost
+# Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+'''
+>>> from boost_shared_ptr_ext import *
+
+ Test that shared_ptr<Derived> can be converted to shared_ptr<Base>
+
+>>> Y.store(YYY(42))
+
+>>> x = X(17)
+>>> null_x = null(x)
+>>> null_x # should be None
+>>> identity(null_x) # should also be None
+
+>>> a = New(1)
+>>> A.call_f(a)
+1
+>>> New(0)
+
+>>> type(factory(3))
+<class 'boost_shared_ptr_ext.Y'>
+>>> type(factory(42))
+<class 'boost_shared_ptr_ext.YY'>
+
+>>> class P(Z):
+... def v(self):
+... return -Z.v(self);
+... def __del__(self):
+... print('bye')
+...
+>>> p = P(12)
+>>> p.value()
+12
+>>> p.v()
+-12
+>>> look(p)
+12
+>>> try: modify(p)
+... except TypeError: pass
+... else: 'print(expected a TypeError)'
+>>> look(None)
+-1
+>>> store(p)
+>>> del p
+>>> Z.get().v()
+-12
+>>> Z.count()
+1
+>>> Z.look_store()
+12
+>>> Z.release()
+bye
+>>> Z.count()
+0
+
+>>> z = Z(13)
+>>> z.value()
+13
+>>> z.v()
+13
+>>> try: modify(z)
+... except TypeError: pass
+... else: 'print(expected a TypeError)'
+
+>>> Z.get() # should be None
+>>> store(z)
+>>> assert Z.get() is z # show that deleter introspection works
+>>> del z
+>>> Z.get().value()
+13
+>>> Z.count()
+1
+>>> Z.look_store()
+13
+>>> Z.release()
+>>> Z.count()
+0
+
+>>> x = X(17)
+>>> x.value()
+17
+>>> look(x)
+17
+>>> try: modify(x)
+... except TypeError: pass
+... else: 'print(expected a TypeError)'
+>>> look(None)
+-1
+>>> store(x)
+>>> del x
+>>> X.count()
+1
+>>> X.look_store()
+17
+>>> X.release()
+>>> X.count()
+0
+
+
+>>> y = Y(19)
+>>> y.value()
+19
+>>> modify(y)
+>>> look(y)
+-1
+>>> store(Y(23))
+>>> Y.count()
+1
+>>> Y.look_store()
+23
+>>> Y.release()
+>>> Y.count()
+0
+'''
+
+def run(args = None):
+ import sys
+ import doctest
+
+ if args is not None:
+ sys.argv = args
+ return doctest.testmod(sys.modules.get(__name__))
+
+if __name__ == '__main__':
+ print("running...")
+ import sys
+ status = run()[0]
+ if (status == 0): print("Done.")
+ sys.exit(status)