python函数调用的四种方式

# -*- coding: UTF-8 -*-
def normal_invoke(x, y):
	print "--normal_invoke:--"
	print "x is %d" %x
	print "y is %d" %y

def keyword_invoke(x, y):
	print "--keyword_invoke--:"
	print "x is %d" % x
	print "y is %d" % y

def normal_tuple_invoke(x, y=2, *values):
	print "--normal_tuple_invoke--"
	print "x is %d" % x
	print "y is %d" % y
	for value in values:
		print "tuple's value has", value

def keyword_dict_invoke(x, y=2, **value_dict):
	print "--keyword_dict_invoke--"
	print "x is %d" % x
	print "y is %d" % y
	for key in value_dict:
		print "key is ", key
		print "value is ", value_dict[key]

#标准调用
normal_invoke(1, 2)
#关键字调用
keyword_invoke(y=1, x=2)
#非关键字可变长参数(tuple)
normal_tuple_invoke(1, 3, 'xyz', 123.4)
#关键字可变长参数(dict)
keyword_dict_invoke(y=1, x=2, arg2='def', arg1='put at the last')

运行结果为：

--normal_invoke:--
x is 1
y is 2
--keyword_invoke--:
x is 2
y is 1
--normal_tuple_invoke--
x is 1
y is 3
tuple's value has xyz
tuple's value has 123.4
--keyword_dict_invoke--
x is 2
y is 1
key is  arg1
value is  put at the last
key is  arg2
value is  def

Process finished with exit code 0