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# -*- coding: utf-8 -*- |
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# |
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# Copyright (c) 2016 dotzero <[email protected]> |
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# |
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# Permission is hereby granted, free of charge, to any person obtaining a copy |
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# of this software and associated documentation files (the "Software"), to deal |
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# in the Software without restriction, including without limitation the rights |
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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# copies of the Software, and to permit persons to whom the Software is |
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# furnished to do so, subject to the following conditions: |
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# |
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# The above copyright notice and this permission notice shall be included |
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# in all copies or substantial portions of the Software. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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from functools import wraps |
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def accepts(*types): |
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def decorated(f): |
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# don't forget self |
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assert 1 + len(types) == f.__code__.co_argcount |
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@wraps(f) |
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def wrapped(*args, **kwargs): |
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for (a, t) in zip(args[1:], types): |
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if isinstance(t, list): |
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t = None if a is None else t[0] |
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assert isinstance(a, t), "Arg %r does not match %s" % (a, t) |
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return f(*args, **kwargs) |
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return wrapped |
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return decorated |
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def lazy(func): |
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@property |
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def wrapper(self): |
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attr_name = '__%s' % func.__name__ |
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try: |
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value = getattr(self, attr_name) |
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except AttributeError: |
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value = func(self) |
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setattr(self, attr_name, value) |
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return value |
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return wrapper |
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dotzero /
habrahabr-api-python
