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switch assertion to an explicit ValueError

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This commit is contained in:
Benjamin Peterson 2012-09-25 11:48:50 -04:00
parent 0dea936e78
commit ba66c2280f
2 changed files with 3 additions and 3 deletions
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4
Lib/lib2to3/fixer_util.py
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@ -274,9 +274,9 @@ def find_root(node):
"""Find the top level namespace."""
# Scamper up to the top level namespace
while node.type != syms.file_input:
assert node.parent, "Tree is insane! root found before "\
"file_input node was found."
node = node.parent
if not node:
raise ValueError("root found before file_input node was found.")
return node
def does_tree_import(package, name, node):