from git import Repo

repo_path = input("Repo path: ")
repo = Repo(repo_path)

branches = []
remotes = []

print("Load remote branches list")
for r in repo.remotes.origin.fetch():
    remotes.append(r.name)

print("Load local branches list and check exist in remote")
for b in repo.branches:
    tb = b.tracking_branch()
    if tb:
        try:
            remotes.index(tb.name)
        except:
            branches.append(b.name)

print("Found deleted branches")
print(*branches, sep="\n")

answer = input("Remove locals (y/n)?: ")

if answer == "y":
    print("Current branch: ", repo.active_branch)
    name = input("Checkout to branch before delete (to pass to remain in current): ")
    if name:
        repo.git.checkout(name)

    for name in branches:
        print("Remove ", name)
        repo.git.branch(D=name)