CODEWITHSUNDEEP
pythongitbashshell
Victor
Victor

Reputation: 193

Run bash command line script in python

Is it possible to run a command line bash script in python? I know of subprocess.call/check_output to run a single command with parameters. However, how do I run

for tag in `git branch -r | grep "tags/" | sed 's/ tags\///'`; do
  git tag -a -m"Converting SVN tags" \
      `echo $tag | grep "tags/" |sed 's/.*tags\///'` \
      refs/remotes/$tag
done

in python? I don't want to put the "line" in a shell script and have python call it.

Thanks!

Upvotes: 0

Views: 615

Answers (1)

hansaplast
hansaplast

Reputation: 11593

When converting from bash script to python you can go two ways:

  1. you take over the program calls and just replace the looping / string processing, e.g. like this:

    from subprocess import check_output
for line in check_output('git branch -r', shell=True).split("\n"):
    line = line.strip()
    # do your replaces here, etc. leaving that for an exercise for you
    # run more `check_call` or `check_output` here

  2. you do it "the right way" and use a e.g. a python git module. That's initially more work, but long term beneficial as you get more out of the box features, and have less bugs as in your "quickly hacked together shell calls"

Edit: As a commenter rightly suggests, you should try to avoid shell=True. In this case, check_output(['git', 'branch', '-r']) is certainly better, in other cases, when you know that the python script will be run on a Linux systems and under a specific shell (e.g. bash), then having shell=True allows you to access environment variables specified under .bashrc, do globbing, etc. For a detailed discussion see here.

Upvotes: 2

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