sys.argv[]

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 argv

script,first,second,third  = argv

print("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 argv
script,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：