Python属性、方法和类管理系列之
class AttrCheckMeta(type): def __new__(meta, cls, parent, attr_dict):import types
attrs_checking_list=['__init__', '__del__', '__call__', '__str__', '__repr__',
'__getattr__', '__setattr__', '__delattr__', '__getattribute__',
'__getitem__', '__setitem__', '__delitem__', '__iter__', '__next__',
'__contains__', '__get__', '__set__', '__delete__', '__lt__',
'__le__', '__gt__', '__ge__', '__eq__', '__add__', '__iadd__',
'__radd__', '__sub__', '__isub__', '__rsub__', '__mul__', '__imul__',
'__neg__', '__pos__', '__abs__', '__floordiv__', '__ifloordiv__',
'__truediv__', '__itruediv__', '__mod__', '__imod__', '__imod__',
'__pow__', '__ipow__', '__concat__', '__iconcat__', '__and__',
'__iand__', '__or__', '__ior__', '__xor__', '__ixor__', '__inv__',
'__invert__ ', '__lshift__', '__ilshift__', '__rshift__', '__irshift__ ',
'__bool__', '__len__', '__nonzero__', '__enter__', '__exit__',
'__new__', '__index__', '__oct__', '__hex__']
for attr,value in attr_dict.items():
#处理方法名前后都包含__，但是名字写错的情况。
if attr[:2]=='__' and attr[-2:]=='__' and isinstance(value, types.FunctionType):
if attr not in attrs_checking_list:
print('found problem function: %s' % attr)
#处理漏写后面__的情况，此时Python会把这个方法吗当成是需要扩张的方法。
elif attr.startswith('_'+cls+'__') and isinstance(value, types.FunctionType):
print('maybe has problem: %s' % attr)
return super(AttrCheckMeta, meta).__new__(meta,cls, parent, attr_dict)
def __init__(self,cls, parent, attr_dict):
super(AttrCheckMeta, self).__init__(cls,parent, attr_dict)
def __call__(self, *args, **kargs):
return super(AttrCheckMeta, self).__call__(*args, **kargs)
class A(metaclass=AttrCheckMeta):
def __new__(cls):
return super(A, cls).__new__(cls)
def __add(self, va, val):
pass
def __innit__(self):
super(A, self).__init__()
a=A()
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