[Python] 动态函数调用（通过函数名）

def eval(*args, **kwargs): # real signature unknown
    """
    Evaluate the given source in the context of globals and locals.
    
    The source may be a string representing a Python expression
    or a code object as returned by compile().
    The globals must be a dictionary and locals can be any mapping,
    defaulting to the current globals and locals.
    If only globals is given, locals defaults to it.
    """
    pass

def function2(name, age):
    print("name: %s, age: %s" % (name, age))


if __name__ == ‘__main__‘:
    eval("function2")("Alice", 11)

    # 或者：
    args = ["Alice", 11]
    kwargs = {}
    eval("function2")(*args, **kwargs)

    """
    输出结果都是：
    name: Alice, age: 11
    """

class Test(object):
    states = [u"大于等于零", u"大于等于二"]
    state2function = {u"大于等于零": "check_gt0", u"大于等于二": "check_gt2"}

    @staticmethod
    def check_gt0(x):
        return x >= 0

    @staticmethod
    def check_gt2(x):
        return x >= 2

    def predict(self, x):
        for state in Test.states:
            check_ans = eval("Test." + Test.state2function[state])(x)  # 调用Test类中的方法
            print(state, Test.state2function[state], x, check_ans)


if __name__ == ‘__main__‘:
    test = Test()
    test.predict(x=-1)
    test.predict(x=1)
    test.predict(x=2)

    """
    输出：
    大于等于零 check_gt0 -1 False
    大于等于二 check_gt2 -1 False
    大于等于零 check_gt0 1 True
    大于等于二 check_gt2 1 False
    大于等于零 check_gt0 2 True
    大于等于二 check_gt2 2 True
    """

def func(a, b):
    return a + b

def test(f, a, b):    
    print f(a, b)

test(func, 3, 5)

def func_year(s):
    print ‘func_year:‘, s
    
def func_month(s):
    print ‘func_month:‘, s  

strs = [‘year‘, ‘month‘]
for s in strs:
    globals().get(‘func_%s‘ % s)(s)
"""
输出：
func_year: year
func_month: month
"""