Get GitHub commits for a user using GitHub Events API

commits.py

import os
import sys
import requests
from pprint import pprint

EVENTS_URL = "https://api.github.com/users/{username}/events"

class Github():
  def __init__(self, token):
    self.token = token
    self.tokenize = identity if token == "" else tokenize(token)

  def push_events(self, username):
    events = self.fetch_user_events(username)

    return list(map(
        lambda ev: ev['payload']['commits'],
        list(filter(lambda ev: ev['type'] == "PushEvent", events)
          )))

  def fetch_user_events(self, username):
    if not username:
      print("Username cannot be blank.")

    try:
      r = requests.get(EVENTS_URL.format(username=username))
    except Exception as e:
      print("Could not fetch user events.", e.__repr__())
      sys.exit(1)

    return r.json()

def identity(r):
  return r

def tokenize(token):
  ''' Appends ?access_token queryparam to the URL. '''
  def inner(url):
    return url + '?access_token={}'.format(token)

  return inner

def get_token():
  try:
    return os.environ['GITHUB_TOKEN']
  except KeyError:
    return ''

def main():
  token = get_token()
  hub = Github(token)
  username = input('Enter your username: ')
  values = hub.push_events(username)

  pprint(values)

if __name__ == '__main__':
    main()