A python script which helps you with cleaning up local and remote branches of merged PR's.

delete_branches.py

from git import Repo
import subprocess, os


class PR:
  def __init__(self, line):
    self.id, self.name, self.branch, self.state = line.split("\t")
    self.branch = self.branch.split(":")[1] # this removes 'your_user_name:'

  def __repr__(self):
    return "PR ID: '" + self.id + "' \tBRANCH: '" + self.branch + "' \t NAME: '" + self.name + "'"


repo = Repo('path/to/repo') # Replace with the path to your repository (don't use backslashs!). E.g. "C://github/myrepo" 
assert not repo.bare

def branch_exists(branchName):
    for ref in repo.references:
        if branchName == ref.name:
            return ref

# Replace "your_user_name" with your correct user name 
returnVal = subprocess.run(['gh', 'pr', 'list', '-A', 'your_user_name', '-s', 'merged'], stdout=subprocess.PIPE).stdout.decode('utf-8')

# for all my recently merged PR's:
for prLine in returnVal.splitlines():
    pr = PR(prLine)

    localBranch = branch_exists(pr.branch)
    originBranch = branch_exists("origin/" + pr.branch)

    if localBranch != None and originBranch != None and localBranch.commit == originBranch.commit:
        print("delete branch '" + pr.branch + "' local and on remote 'origin'")
        repo.delete_head(localBranch)
        repo.remotes.origin.push(":" + originBranch.remote_head)

Instalation.md

Install Python

The scrip requires Python >=3.6 https://www.python.org/downloads/

Install needed library's:

run pip install GitPython in the CMD

Install Github cli: https://github.com/cli/cli/releases/