Embed bash in python

Question

I am writting a Python script and I am running out of time. I need to do some things that I know pretty well in bash, so I just wonder how can I embed some bash lines into a Python script.

Thanks

Answer 1

The ideal way to do it:

def run_script(script, stdin=None):     """Returns (stdout, stderr), raises error on non-zero return code"""     import subprocess     # Note: by using a list here (['bash', ...]) you avoid quoting issues, as the      # arguments are passed in exactly this order (spaces, quotes, and newlines won't     # cause problems):     proc = subprocess.Popen(['bash', '-c', script],         stdout=subprocess.PIPE, stderr=subprocess.PIPE,         stdin=subprocess.PIPE)     stdout, stderr = proc.communicate()     if proc.returncode:         raise ScriptException(proc.returncode, stdout, stderr, script)     return stdout, stderr  class ScriptException(Exception):     def __init__(self, returncode, stdout, stderr, script):         self.returncode = returncode         self.stdout = stdout         self.stderr = stderr         Exception().__init__('Error in script') 

You might also add a nice __str__ method to ScriptException (you are sure to need it to debug your scripts) -- but I leave that to the reader.

If you don't use stdout=subprocess.PIPE etc, the script will be attached directly to the console. This is really handy if you have, for instance, a password prompt from ssh. So you might want to add flags to control whether you want to capture stdout, stderr, and stdin.