Script to list the most recent version of a PyPI package released before a particular date

pybefore.py

#!/usr/bin/env python3

import sys
import requests
from datetime import datetime, timezone

# Ok I'll be honest ChatGPT wrote the vast majority of this
# Use at your own risk

def get_latest_version_before_date(package_name, cutoff_date):
    """
    Fetch the latest version of the package that was released before the specified cutoff_date.

    Args:
    package_name (str): The name of the package on PyPI.
    cutoff_date (str): The cutoff date in ISO 8601 format (YYYY-MM-DD).

    Returns:
    str: The version of the latest release before the cutoff date or None if no release matches.
    """
    # Convert cutoff_date to a datetime object for comparison
    cutoff_datetime = datetime.fromisoformat(cutoff_date).replace(tzinfo=timezone.utc)

    # Request package information from PyPI
    response = requests.get(f'https://pypi.org/pypi/{package_name}/json')
    if response.status_code != 200:
        return None

    data = response.json()
    releases = data.get('releases', {})

    # Initialize variables to find the latest version before the cutoff date
    latest_version = None
    latest_release_date = datetime.min.replace(tzinfo=timezone.utc)

    # Iterate over all versions and their releases
    for version, release_info in releases.items():
        for release in release_info:
            release_date = datetime.fromisoformat(release['upload_time_iso_8601'].replace('Z', '+00:00'))
            # Check if this release is before the cutoff and after the last found release
            if release_date < cutoff_datetime and release_date > latest_release_date:
                latest_version = version
                latest_release_date = release_date

    return latest_version

# Example usage
cutoff_date = sys.argv[1]
for package_name in sys.argv[2:]:
    latest_version = get_latest_version_before_date(package_name, cutoff_date)
    print(f"{package_name}=={latest_version}")