执行一个从python 2.6脚本中的终端接收参数的终端命令

Question

My environment uses Python 2.6 and I'm new to Python. I need to write a script that runs a file decoding command which takes several arguments from the command line. My problem is I can't parse arguments taken from the terminal to the file decoding command.

For example if my program name is x.py and when i run "x.py Desktop/abc.txt" how can i pass Desktop/abc.txt as an argument to the cat command?

import commands
import sys

a=open("b.txt","w") 
a.write(commands.getoutput('cat sys.argv[1]'))

When i researched it seemed that the above program should work but it didn't. Please help.

Answer 1

You're mixing up the terminal commands and Python commands. If you have a file called abc.py with the following code:

import sys
print sys.argv[1]

And you run it with python abc.py arg1 , it should print out arg1 .

For a cleaner and easier to read way of using command-line arguments if you want to control things like make sure they are int or allow multiple or whatever, I've had a lot of success using the argparse module in Python - it's much easier to use than the sys.argv style of parsing command-line arguments. Check out the official tutorial / docs here: https://docs.python.org/2/howto/argparse.html

Answer 2

您应该将commands.getoutput('cat sys.argv[1]')更改为commands.getoutput('cat %s' % (sys.argv[1],))