*args and **kwds in Python functions

*args and **kwds as formal parameters:

When *args is a formal parameter, the parameter that does not specify a parameter name is matched as a tuple. **kwds, as a dictionary, matches parameters that specify the parameter name. Such as:

def myfunc (a,*args,**kwds): print ' A: ', a for I in Args:print I for I,j in Kwds.iteritems (): Print I,j>>>myfunc (1,2,3,a=1,b=2) ' A: ' 123a 1b 2

*args and **kwds as arguments:

>>>args= >>>kwds={"C": 5, "D": 6}>>>myfunc (0,*args,**kwds) ' A: ' 112c 5d 6

When you are an argument, you need to add * and * *

*args and **kwds in Python functions