Solved plot for duck

solved.py

import argparse
import json
import urllib.request
from matplotlib import pyplot as plt

STATUS_URL_FMT = 'https://codeforces.com/api/user.status?handle={}'
CONTESTS_URL = 'https://codeforces.com/api/contest.list'
DEFAULT_LO, DEFAULT_HI = 500, 3800
STEP = 100
FIGSIZE = (12, 6)

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('handle', help='CF handle')
    parser.add_argument('-r', default=f'{DEFAULT_LO},{DEFAULT_HI}', help='rating range in the form of lo,hi')
    args = parser.parse_args()

    handle = args.handle
    try:
        lo, hi = map(int, args.r.split(','))
    except ValueError:
        raise ValueError(f'Range argument must be of the form lo,hi')

    status_resp = json.loads(urllib.request.urlopen(STATUS_URL_FMT.format(handle)).read())
    contests_resp = json.loads(urllib.request.urlopen(CONTESTS_URL.format(handle)).read())
    contest_map = {c['id']: c['startTimeSeconds'] for c in contests_resp['result']}
    solved = set()
    by_type = {'C': [], 'O': [], 'V': [], 'P': []}
    for sub in sorted(status_resp['result'], key=lambda sub: sub['creationTimeSeconds']):
        prob = sub['problem']
        typ = sub['author']['participantType'][0]
        if not (sub['verdict'] == 'OK' and typ in by_type and prob.get('contestId') in contest_map
                    and 'rating' in prob and lo <= prob['rating'] <= hi):
            continue
        key = prob['name'], contest_map.get(prob['contestId'])
        if key not in solved:
            solved.add(key)
            by_type[typ].append(prob)

    all_ratings = [[prob['rating'] for prob in v] for v in by_type.values()]
    nice_names = ['Contest: {}', 'Unofficial: {}', 'Virtual: {}', 'Practice: {}']
    labels = [name.format(len(ratings)) for name, ratings in zip(nice_names, all_ratings)]
    total = sum(map(len, all_ratings))

    hist_bins = list(range(lo - STEP, hi + 2 * STEP, STEP))
    plt.figure(figsize=FIGSIZE)
    plt.hist(all_ratings, stacked=True, bins=hist_bins, label=labels)
    plt.xlabel('Problem rating')
    plt.ylabel('Number solved')
    plt.legend(title=f'Total: {total}', title_fontsize=plt.rcParams['legend.fontsize'],
               loc='upper right')
    plt.title(f'Rated problems solved by {handle} in range [{lo}, {hi}]')
    plt.show()

if __name__ == '__main__':
    main()