Python variable length parameters

The list of function parameters defined in Python can be amazing, mainly including variable parameters with non-Keyword variables and keywords.

Variable Length Parameter

First, we define the following functions:

def tuple_var_args(arg1,arg2='default arg2',*vargs_tuple):    print 'format arg1:',arg1    print 'format arg2:',arg2    for arg in vargs_tuple:        print 'another arg:',arg

Then you can call it as follows:

Substring ('arg1') tuple_var_args ('arg1', 'arg2') tuple_var_args ('arg1', arg2 = 'arg2') tuple_var_args ('arg1', 'arg2 ', 'arg3') tuple_var_args ('arg1', 'arg2', * ('arg3 ',))
Tuple_var_args ('arg1', * ('arg3',) # Here arg3 is passed to arg2


Keyword variable parameters
First, define the following functions:
def dict_var_args(arg1,arg2='default arg2',**vargsd):    print 'format arg1:',arg1    print 'format arg2:',arg2    for arg in vargsd:        print 'another arg:',arg
The call method is as follows:
dict_var_args('arg1')dict_var_args('arg1','arg2')dict_var_args('arg1',arg2='arg2')dict_var_args('arg1','arg2',arg3='arg3')dict_var_args('arg1',arg3='arg3')dict_var_args(1,**{'foo':4,'bar':5}) dict_var_args(**{'arg1':1,'foo':4,'bar':5})

Hybrid use
Define the following functions
def tuple_dict_var_args(arg1,arg2='default arg2',*tuple_args,**vargsd):    print 'format arg1:',arg1    print 'format arg2:',arg2    for t_arg in tuple_args:        print 'another no-key arg:',t_arg    for arg in vargsd:        print 'another key arg:',arg

The call method is as follows:
Tuple_dict_var_args (, 5) #3, 4, 5 pass to * tuple_arstuple_dict_var_args (1, * (,), a = 1, B = 2) tuple_dict_var_args, * (,), ** {'A': 'A', 'B': 'B '})