how to use os.system() in python for running an shell order

Question

In some shell script, you need to confirm "yes" to run the shell, well, an easier way is using "yes" and pipe, like this:

yes | test.py

then, you can run the shell script automatically without answer "yes" anymore. today, when i use this in python by trying : os.system("yes|**.sh"), i got an fault.

Here is my test.py file:

import os
def f():
    cmd1 = "yes | read "          
    os.system(cmd1)
f()

and run in shell by typing : python test.py. the fault information is : yes: standard output: Broken pipe yes: write error

but if i type "yes|read" in shell，it works well. may anyone tell me why?

Solution

try this

import os
def f():
    cmd1 = "echo 'yes' | read "
    os.system(cmd1)
f()