git bash commands with python or Gitpyhon

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So I have follwoing bash command which is part of a script, that will list just remote releases branches in a repo with no updates in more than 6 months

for b in $(git branch -r --merged | grep release) ; do echo "$(git log -1  --pretty=format:"%Cgreen%as" --before '7 month ago' $b) $b"; done

this will print :

2020-04-27 origin/release/1.1
2020-04-28 origin/release/1.2
2020-04-28 origin/release/1.3
2020-04-29 origin/release/1.4
2020-05-01 origin/release/1.5

The idea is that script will print. "Following merged branches are going to be removed: " and then execute the git push origin --delete {branch} to those branches

Now will like to achieve something similar in python since I´m starting with it...but not quite expert. Was trying with something like this but this doesn´t show the same output than bash:

import subprocess

def release_branches():
    result_release = subprocess.getoutput("git branch -r --merged | grep release ")
    return [b.strip() for b in result_release.split('\n')]
        

def branch_stale(branch):
    commits_since_seven = subprocess.getoutput(f"git log -1 --pretty=format:"\%Cgreen%as\"{branch} --before '7 month ago'")
    if commits_since_seven is not None:
        return True


for branch in release_branches():
    if branch_stale(branch):
        print (branch)

Also is this the best way with subprocess and catching output? or is it better to do it with GitPython instead? thank you!

Jun 21 in Linux Administration by Korak
• 5,820 points
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