[Python] Dynamic function call (via function name)

2018-04-09 Update

Using the built-in function in Python eval () , function Description:

def # Real signature Unknown    """     Evaluate The given source in the context of globals and locals.        The source is a string representing a Python expression    or a code object as returned by compile ().    The globals must be a dictionary and locals can is any mapping, defaulting to the current    globals and locals.    If only globals are given, locals defaults to it.     """    Pass

Example 1:

deffunction2 (name, age):Print("Name:%s, age:%s"%(name, age))if __name__=='__main__': eval (  "function2") ("Alice", one by one) #or:args = ["Alice ", 11] Kwargs={} eval (  "function2") (*args, * *Kwargs) """The results are: Name:alice, age:11"""

Example 2:

classTest (object): States= [u"greater than or equal to zero", u"greater than or equal to two"] State2function= {u"greater than or equal to zero":"check_gt0", u"greater than or equal to two":"CHECK_GT2"}@staticmethoddefcheck_gt0 (x):returnX >=0 @staticmethoddefCHECK_GT2 (x):returnX >= 2defPredict (self, x): forStateinchtest.states: check_ans = eval ("Test." + test.state2function[state]) (x) #  Call a method in the Test class             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)    """output: greater than or equal to zero check_gt0-1 false greater than or equal to two check_gt2-1 false is greater than or equal to zero check_gt0 1 True is greater than or equal to two CHECK_GT2 1 False Greater than or equal to zero Check_gt0 2 true greater than or equal to two CHECK_GT2 2 true"""

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2017-08-09

The corresponding function is obtained by the string function name

The use of functions as parameters is more intuitive:

def func (A, b):     return A + bdef  Test (F, A, B):        print3, 5)

However, in some cases, the question of which function to pass is not predetermined, for example, the function name is related to a variable. You can use func = Globals (). Get (Func_name) to get the function:

defFunc_year (s):Print 'func_year:', SdefFunc_month (s):Print 'Func_month:', S STRs= [' Year','Month'] forSinchstrs:globals (). Get ('func_%s'%s) (s)"""Output: Func_year:yearfunc_month:month"""

[Python] Dynamic function call (via function name)