Create a bar chart showing monthly commits to a Git repository over time

git-commits-graph.py

import altair as alt
import pandas as pd
from pydriller import Repository

repo_dates = []

for commit in Repository('/path/to/repository').traverse_commits():
    repo_dates.append(commit.committer_date)

d = pd.DataFrame(dict(commit_date=pd.to_datetime(repo_dates, utc=True), commits=1))

r = d.set_index("commit_date").resample("1m").count()

alt.Chart(r.reset_index()).mark_bar(color="blue").encode(
    x='yearmonth(commit_date):O',
    y='commits:Q'
).properties(width=600)