How to plot cumulative Gitlab group members using matplotlib

This is based on my previous post to find the group ID by group name.

import matplotlib.pyplot as plt
import matplotlib.dates as mdates
from datetime import datetime
import gitlab

def plot_cumulative_members(members):
    # Convert date strings to datetime objects and sort
    dates = sorted([datetime.strptime(member["access_granted_date"], '%Y-%m-%dT%H:%M:%S.%fZ') for member in members])

    # Calculate cumulative count
    cumulative_count = range(1, len(dates) + 1)

    # Plotting
    plt.figure(figsize=(10, 6))
    plt.plot(dates, cumulative_count, marker='o')
    plt.title('Cumulative Number of Users in GitLab Group Over Time')
    plt.xlabel('Date')
    plt.ylabel('Cumulative Number of Users')
    plt.grid(True)
    plt.gca().xaxis.set_major_formatter(mdates.DateFormatter('%Y-%m-%d'))
    plt.gca().xaxis.set_major_locator(mdates.YearLocator())
    plt.gcf().autofmt_xdate()  # Rotation
    plt.show()

group_id = get_gitlab_group_id("Protectors of the Footprint Realm", 'glpat-...')
members = get_group_members(group_id, 'glpat-...')
with plt.xkcd():
    plot_cumulative_members(members)