first-pep-after-3xxx.py

"""
Find the first PEP created after the last PEP created in the 3xxx range.
"""
import datetime as dt
import json
import urllib.request

with urllib.request.urlopen("https://peps.python.org/peps.json") as url:
    peps = json.loads(url.read().decode())

for pep in peps.values():
    pep["number"] = int(pep["number"])
    pep["created_dt"] = dt.datetime.strptime(pep["created"], "%d-%b-%Y")

peps = sorted(peps.values(), key=lambda x: x["created_dt"])

last_3k = next(pep for pep in reversed(peps) if 3000 <= pep["number"] <= 3999)
next_pep = next(pep for pep in peps if pep["created_dt"] > last_3k["created_dt"])

print(f"Last PEP: {last_3k['number']}, {last_3k['created']}")
print(f"Next PEP: {next_pep['number']}, {next_pep['created']}")
# Last PEP: 3156, 12-Dec-2012
# Next PEP: 432, 28-Dec-2012