argv(argument variable)，即参数变量；sys.argv[]是用来获取命令行参数的，sys.argv[0]表示代码文件本身的路径。
举例1：
from sys import argvscript,first,second,third = argvPRint("The scrpit is called: ",script)print("Your first variable is: ",first)print("Your second variable is: ",second)print("Your third variable is: ",third)将上面的脚本保存为EX13.py，调用时，在cmd窗口运行EX13.py程序，并给出参数值。 
举例2：
from sys import argvscript,filename = argv #使用argv获取脚本路径，给到script；提供文件路径给到参数filename，在执行命令时给出txt = open(filename)print("Here's your script: %r "%script)print("Here's your file %r: "%filename)print(txt.read())print("Type the filename again:")file_again = input("> ")#在执行过程中输入参数txt_again = open(file_again)print(txt_again.read())将上面的脚本保存为EX15.py，文件为ex15_sample.txt，执行结果如下： 
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