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Python的staticmethod和classmethod

��夜 — Wed, 16 Apr 2014 04:01:00 GMT

最�q�专职做起了Python�Q�得�U�篏些Python的知识�?br />-----------------
阅读代码的时候，看到了classmethod。staticmethod用的挺多�Q�classmethod一直没用过�Q�感觉有些迷惑�?br />Google了一��文章，讲的挺清楚：class Base(object):
    name = "Base"

    @classmethod
    def foo(cls):
        print cls.name

    @staticmethod
    def foo_static1():
        print Base.name

    @staticmethod
    def foo_static2(cls):
        print cls.name

    @staticmethod
    def foo_static3(cls):
        # if not isinstance(cls, type):
        if isinstance(cls, Base):
            cls = cls.__class__
        print cls.name

class A(Base):
    name = "A"
    def __init__(self):
        self.name = "I am '%s'" % A.name


class B(Base):
    name = "B"
    def __init__(self):
        self.name = "I am '%s'" % B.name

    @classmethod
    def foo(cls):
        print "<%s>" % cls.name

    @staticmethod
    def foo_static1():
        print "<%s>" % Base.name

def testA():
    obj = A()
    obj.foo()
    obj.foo_static1()
    obj.foo_static2(A)
    obj.foo_static2(obj)
    obj.foo_static3(A)
    obj.foo_static3(obj)
    A.foo()
    A.foo_static1()

def testB():
    obj = B()
    obj.foo()
    obj.foo_static1()

def run_test(func, *args, **kwargs):
    print "======================="
    func(*args, **kwargs)
    print ""

if __name__ == '__main__':
    run_test(testA)
    run_test(testB)

��夜 2014-04-16 12:01 发表评论

Python内置函数--dir

��夜 — Fri, 16 Oct 2009 12:32:00 GMT

摘要: 1.命��o介绍最�q�学习�ƈ使用了一个python的内�|�函数dir�Q�首先help一下： >>> help(dir)Help on built-in function dir in module __builtin__:dir() dir([object])... 阅读全文

��夜 2009-10-16 20:32 发表评论