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u"""
Fixer for os.getcwd() -> os.getcwdu().
Also warns about "from os import getcwd", suggesting the above form.
"""
from lib2to3 import fixer_base
from lib2to3.fixer_util import Name
class FixGetcwd(fixer_base.BaseFix):
PATTERN = u"""
power< 'os' trailer< dot='.' name='getcwd' > any* >
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import_from< 'from' 'os' 'import' bad='getcwd' >
"""
def transform(self, node, results):
if u"name" in results:
name = results[u"name"]
name.replace(Name(u"getcwdu", prefix=name.prefix))
elif u"bad" in results:
# Can't convert to getcwdu and then expect to catch every use.
self.cannot_convert(node, u"import os, use os.getcwd() instead.")
return
else:
raise ValueError(u"For some reason, the pattern matcher failed.")
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