How to send Python variable to bash variable?

问题

I am trying to use Python to select a variable from a list, then speak it outloud using the bash command. Right now I have something like this

foo = ["a","b","c","d"]
from random import choice
x = choice(foo)
foo.remove(x)
from os import system
system('say x')

This says "x", what I need is for it to say the value of the x variable.

回答1:

I suppose you can use os.system, but better might be subprocess:

import subprocess
subprocess.call(['say',x])

回答2:

you are passing astring you can use value of x like

sytem('say {0}'.format(x))

When passing strings you can use string formatting. As you realized you need to get the value of x in the string not the variable x http://docs.python.org/library/string.html#format-examples

回答3:

You can use format:

system('say {}'.format(x))

回答4:

use string formatting:

In [9]: x="ls -ld"

In [10]: os.system("{0}".format(x))
drwxr-xr-x 41 monty monty 4096 2012-10-10 22:46 .
Out[10]: 0

来源：https://stackoverflow.com/questions/12826250/how-to-send-python-variable-to-bash-variable