1 files changed, 18 insertions, 0 deletions
diff --git a/third_party/python/pip_tools/piptools/_compat/contextlib.py b/third_party/python/pip_tools/piptools/_compat/contextlib.py
new file mode 100644
index 0000000000..04039ccb01
--- /dev/null
+++ b/third_party/python/pip_tools/piptools/_compat/contextlib.py
@@ -0,0 +1,18 @@
+# Ported from python 3.7 contextlib.py
+class nullcontext(object):
+    """Context manager that does no additional processing.
+    Used as a stand-in for a normal context manager, when a particular
+    block of code is only sometimes used with a normal context manager:
+    cm = optional_cm if condition else nullcontext()
+    with cm:
+        # Perform operation, using optional_cm if condition is True
+    """
+
+    def __init__(self, enter_result=None):
+        self.enter_result = enter_result
+
+    def __enter__(self):
+        return self.enter_result
+
+    def __exit__(self, *excinfo):
+        pass