How to use *args and **kwargs in Python
阿新 • • 發佈:2018-12-23
這篇文章寫的滿好的耶,結論: 1星= array, 2星=dictionary.
1星範例:
def test_var_args(farg, *args): print "formal arg:", farg for arg in args: print "another arg:", arg test_var_args(1, "two", 3)
Results:
formal arg: 1 another arg: two another arg: 3
2星範例:
def test_var_kwargs(farg, **kwargs): print "formal arg:", farg for key in kwargs: print "another keyword arg: %s: %s" % (key, kwargs[key]) test_var_kwargs(farg=1, myarg2="two", myarg3=3)
Results:
formal arg: 1 another keyword arg: myarg2: two another keyword arg: myarg3: 3
經典範例:
def test_var_args_call(arg1, arg2, arg3): print "arg1:", arg1 print "arg2:", arg2 print "arg3:", arg3 args = ("two", 3) test_var_args_call(1, *args)
Results:
arg1: 1 arg2: two arg3: 3
def test_var_args_call(arg1, arg2, arg3): print "arg1:", arg1 print "arg2:", arg2 print "arg3:",arg3 kwargs = {"arg3": 3, "arg2": "two"} test_var_args_call(1, **kwargs)
Results:
arg1: 1 arg2: two arg3: 3