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1import sys
2import warnings
5class prepended_to_syspath:
6 """A context for prepending a directory to sys.path for a second."""
8 def __init__(self, dir):
9 self.dir = dir
11 def __enter__(self):
12 if self.dir not in sys.path:
13 sys.path.insert(0, self.dir)
14 self.added = True
15 else:
16 self.added = False
18 def __exit__(self, type, value, traceback):
19 if self.added:
20 try:
21 sys.path.remove(self.dir)
22 except ValueError:
23 pass
24 # Returning False causes any exceptions to be re-raised.
25 return False