87 lines
1.9 KiB
Python
87 lines
1.9 KiB
Python
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#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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"""
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Topic: 强制编码规约
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Desc :
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"""
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class MyMeta(type):
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def __init__(self, clsname, bases, clsdict):
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super().__init__(clsname, bases, clsdict)
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# clsname is name of class being defined
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# bases is tuple of base classes
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# clsdict is class dictionary
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class Root(metaclass=MyMeta):
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pass
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class A(Root):
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pass
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class B(Root):
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pass
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class NoMixedCaseMeta(type):
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def __new__(cls, clsname, bases, clsdict):
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for name in clsdict:
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if name.lower() != name:
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raise TypeError('Bad attribute name: ' + name)
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return super().__new__(cls, clsname, bases, clsdict)
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class Root(metaclass=NoMixedCaseMeta):
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pass
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class A(Root):
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def foo_bar(self): # Ok
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pass
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class B(Root):
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def fooBar(self): # TypeError
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pass
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from inspect import signature
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import logging
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class MatchSignaturesMeta(type):
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def __init__(self, clsname, bases, clsdict):
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super().__init__(clsname, bases, clsdict)
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sup = super(self, self)
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for name, value in clsdict.items():
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if name.startswith('_') or not callable(value):
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continue
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# Get the previous definition (if any) and compare the signatures
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prev_dfn = getattr(sup,name,None)
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if prev_dfn:
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prev_sig = signature(prev_dfn)
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val_sig = signature(value)
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if prev_sig != val_sig:
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logging.warning('Signature mismatch in %s. %s != %s',
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value.__qualname__, prev_sig, val_sig)
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# Example
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class Root(metaclass=MatchSignaturesMeta):
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pass
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class A(Root):
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def foo(self, x, y):
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pass
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def spam(self, x, *, z):
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pass
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# Class with redefined methods, but slightly different signatures
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class B(A):
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def foo(self, a, b):
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pass
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def spam(self,x,z):
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pass
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