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author | Berker Peksag <berker.peksag@gmail.com> | 2016-07-15 16:13:05 +0300 |
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committer | Berker Peksag <berker.peksag@gmail.com> | 2016-07-15 16:13:05 +0300 |
commit | eefb633becc8ba6ae7d30c04aaa01a5740b92cbb (patch) | |
tree | 6a8d976e7b8f8426f64f6b1aa848b24363e2490a /Lib/idlelib/delegator.py | |
parent | 771fbd629810cb7dc48e10cc7d687b313c622fbf (diff) | |
parent | e30c0dfb84728e8c3f9e2f695b64071e53e1811b (diff) | |
download | cpython-eefb633becc8ba6ae7d30c04aaa01a5740b92cbb.tar.gz |
Issue #27518: Merge from 3.5
Diffstat (limited to 'Lib/idlelib/delegator.py')
-rw-r--r-- | Lib/idlelib/delegator.py | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/Lib/idlelib/delegator.py b/Lib/idlelib/delegator.py new file mode 100644 index 0000000000..dc2a1aaeea --- /dev/null +++ b/Lib/idlelib/delegator.py @@ -0,0 +1,33 @@ +class Delegator: + + def __init__(self, delegate=None): + self.delegate = delegate + self.__cache = set() + # Cache is used to only remove added attributes + # when changing the delegate. + + def __getattr__(self, name): + attr = getattr(self.delegate, name) # May raise AttributeError + setattr(self, name, attr) + self.__cache.add(name) + return attr + + def resetcache(self): + "Removes added attributes while leaving original attributes." + # Function is really about resetting delagator dict + # to original state. Cache is just a means + for key in self.__cache: + try: + delattr(self, key) + except AttributeError: + pass + self.__cache.clear() + + def setdelegate(self, delegate): + "Reset attributes and change delegate." + self.resetcache() + self.delegate = delegate + +if __name__ == '__main__': + from unittest import main + main('idlelib.idle_test.test_delegator', verbosity=2) |