ex18.py

 1 # this one is like your scripts with argv
 2 def print_two(*args):     #函数命名规则和变量名一样，只能以字母、数字和下划线组成，数字不可以作为开头
 3     arg1, arg2 = args
 4     print ("arg1: %r, arg2: %r" % (arg1,arg2))  # 不要混淆TAB键和空格键，这里要用到4个空格
 5
 6 # ok ,that *args is actually pointless,we can just do this
 7 def print_two_again(arv1,arv2):
 8     print ("arv1: %r, arv2: %r" % (arv1,arv2))  #变量参数要和定义函数内的参数相一致
 9
10 # this just takes one argument
11 def print_one(arg1):             #不要遗忘冒号
12     print("arg1: %r" % arg1)
13
14 #this one takes no argument
15 def print_none():
16     print ("I got nothin")
17
18 print_two("ZED","Shaw")
19 print_two_again("ZED","Shaw")
20 print_one("First!")
21 print_none()
22
23
24