List git commits from all repositories in a folder

my_git_log.py

import subprocess
import datetime
import os
import argparse
import re

def get_git_log(root_path: str, month: int, author: str):
    year = datetime.datetime.utcnow().year
    m = datetime.datetime(year, month, 1)
    em = (m + datetime.timedelta(days=32)).month
    start_date = f"{year}-{month}-01"
    end_date = f"{year}-{em}-01"
    commits = {}
    for d, _, _ in os.walk(root_path):
        if os.path.exists(os.path.join(d, ".git")):
            git_log = [
                "git",
                f"--git-dir={d}/.git",
                f"--work-tree={d}",
                "log",
                '--pretty=%ad %s',
                f"--author={author}",
                "--before",
                end_date,
                "--after",
                start_date,
                "--date=short",
            ]
            p = subprocess.run(git_log, capture_output=True, text=True, check=True)
            result = p.stdout.split("\n")
            for l in result:
                if len(l.strip()) > 0:
                    dt = l.split()[0]
                    commits[dt] = commits.get(dt, []) + [f'{l.replace(dt, "").strip()} ({d.split("/")[-1]})']

    return commits

def summarize_jira(commits):
    r_jira = r'([a-zA-z]{3,4}-[0-9]+)\s'
    stories = set()
    for c in commits:
        js = re.findall(r_jira, c)
        stories = stories.union(set(js))
    return stories



parser = argparse.ArgumentParser()
parser.add_argument("month", type=int)
parser.add_argument("author", type=str)
parser.add_argument("--path", dest="path", required=False, default=os.getcwd())
parser.add_argument("--s", action="store_true")
if __name__ == "__main__":
    args = parser.parse_args()
    commits = get_git_log(args.path, args.month, args.author)
    for k, v in sorted(commits.items()):
        print(k)
        to_print = list(summarize_jira(v)) if args.s else v
        for c in to_print:
            print(f'\t{c}')