git_remote_cleanup.py

import delegator

c = delegator.run('git branch -r --merged').pipe('grep -v -E "HEAD|store|stage"')
merged_branches = c.out.splitlines()[:-1]

for i in merged_branches:
    stripped = i.strip()
    replaced = stripped.replace('origin/', '')
    try:
        c = delegator.run('git show --format="%ci %cr %an" {0}'.format(stripped)).pipe('head -n 1')
    except BrokenPipeError as e:
        print(stripped)
    delegator.run('git push origin --delete {0}'.format(replaced))
    with open('removed.txt', mode='a', encoding='utf-8') as f:
        f.write('{0} {1}\n'.format(c.out.strip(), stripped))