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3\WKRQ۸Ӿጱളݗܐᦓ Ӿࢵ Ӥၹ By laixintao
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Ø Luatable Ø C Ø Java …… Ø JavaScript! Ø Python __method__
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• • “” • “xxx” • Dunder method
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http://lucumr.pocoo.org/2011/7/9/python-and-pola/
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——Leonardo Rochael
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Python“” • Python “” •
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__init__ __new__ __del__ https://www.python.org/download/releases/2.2/descrintro/#__new__
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__new__
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__new__
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https://www.python.org/dev/peps/pep-0207/ https://docs.python.org/3/reference/expressions.html#value-comparisons obj1 __lt__x obj1 < x obj1.__lt__(x) x > obj1 1. obj1 > x 2. : obj1 < x 3. : obj1.__lt__(x)
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@functools.total_ordering • • __eq__
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https://github.com/zestyping/q/blob/master/q.py
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• __pot__(self) +a • __add__(self, other) a + b • __add__(self, other) b + a • __iadd__(self, other) • __int__(self) https://docs.python.org/3/library/operator.html
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• __str__ str() • __repr__ repr() __str__ • __bytes__ bytes() • __format__ format() • __dir__ dir() • __hash__ hash() https://dbader.org/blog/python-repr-vs-str
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format
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dir() https://github.com/laike9m/pdir2
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hash () • • __eq__ • __eq__ hashable https://www.kawabangga.com/posts/1821 https://docs.python.org/3/reference/datamodel.html#object.__hash__
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__getattr__ __setattr__ __delattr__ __getattribute__ featurehttps://www.kawabangga.com/posts/2809
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https://docs.python.org/3/reference/datamodel.html#more-attribute-access-for-new-style-classes
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__setattr__
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• __len__() len() __bool__() return self.__len__() • __getitem__() obj[key] • __setitem__() obj[key] = value • __missing__() obj[non_exist] • __delitem__() del obj[key] • __iter__() • __reversed__() reversed() __getattr__ __setattr__ __delattr__ __getattribute__ [] .
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Python Python forhttp://effbot.org/zone/python-for-statement.htm __getitem__() for
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• __instancecheck__(self, instance) isinstance(instance, class) • __subclasscheck__(self, subclass) issubclass(subclass, class)
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sized https://github.com/python/cpython/blob/9d4712bc8f26bf1d7e62 6b53ab092fe030bcd68d/Lib/_collections_abc.py#L359
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First Class Object • • • • https://dbader.org/blog/python-first-class-functions https://www.kawabangga.com/posts/2613
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__call__()
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• • __enter__() • __exit__() https://www.kawabangga.com/posts/2010
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print
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contextlib.contextmanager
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@property https://www.kawabangga.com/posts/2302
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…… •descr.__get__(self, obj, type=None) -> value •descr.__set__(self, obj, value) -> None •descr.__delete__(self, obj) -> None https://docs.python.org/3.7/howto/descriptor.html
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ORM
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function method • method __dict__ function • function __get__() method https://docs.python.org/3.7/howto/descriptor.html#functions-and-methods
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• __copy__(self) copy.copy() • __deepcopy__(self, memodict={}) copy.deepcopy()
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pickle • object.__getnewargs_ex__() • object.__getnewargs__() • object.__getstate__() • object.__setstate__(state) • object.__reduce__() • object.__reduce_ex__(protocol) https://www.kawabangga.com/posts/2782
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@laixintao www.kawabangga.com SRE Python