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only do this sys.stderr replacing on CPython

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Benjamin Peterson 2011-03-06 17:08:40 -06:00
parent 5edae7ea5e
commit bf12cdc24a
1 changed files with 7 additions and 4 deletions
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11
Lib/lib2to3/pytree.py
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@ -743,9 +743,11 @@ class WildcardPattern(BasePattern):
else: else:
# The reason for this is that hitting the recursion limit usually # The reason for this is that hitting the recursion limit usually
# results in some ugly messages about how RuntimeErrors are being # results in some ugly messages about how RuntimeErrors are being
# ignored. # ignored. We don't do this on non-CPython implementation because
save_stderr = sys.stderr # they don't have this problem.
sys.stderr = StringIO() if hasattr(sys, "getrefcount"):
save_stderr = sys.stderr
sys.stderr = StringIO()
try: try:
for count, r in self._recursive_matches(nodes, 0): for count, r in self._recursive_matches(nodes, 0):
if self.name: if self.name:
@ -759,7 +761,8 @@ class WildcardPattern(BasePattern):
r[self.name] = nodes[:count] r[self.name] = nodes[:count]
yield count, r yield count, r
finally: finally:
sys.stderr = save_stderr if hasattr(sys, "getrefcount"):
sys.stderr = save_stderr
def _iterative_matches(self, nodes): def _iterative_matches(self, nodes):
"""Helper to iteratively yield the matches.""" """Helper to iteratively yield the matches."""