Add a comment to smartdict.py.

python/m5/smartdict.py:
    Add a comment explaining why this actually works.

--HG--
extra : convert_revision : 39cbde547f4bf6cf626ab1c0b6ef56a5788b09b8
This commit is contained in:
Steve Reinhardt 2005-03-15 19:41:51 -05:00
parent 6aaa9a7d63
commit 42753edb3c

View file

@ -74,6 +74,12 @@ class SmartDict(dict):
return other / self.convert(other) return other / self.convert(other)
# __getitem__ uses dict.get() to return 'False' if the key is not
# found (rather than raising KeyError). Note that this does *not*
# set the key's value to 'False' in the dict, so that even after
# we call env['foo'] we still get a meaningful answer from "'foo'
# in env" (which calls dict.__contains__, which we do not
# override).
def __getitem__(self, key): def __getitem__(self, key):
return self.Proxy(dict.get(self, key, 'False')) return self.Proxy(dict.get(self, key, 'False'))