projektB - changed

import json
import urllib
from urllib.request import urlopen
from datetime import datetime


def date_format(date: str):  # making format of date 'better'
weekday = date[0:4]
    day = date[4:6]
    month_and_year = date[6:15]

    day_suffix = "th"

    if day == '01' or day == '21' or day == '31':
        suffix = "st"
    elif day == '02' or day == '22':
        suffix = "nd"
    elif day == '03' or day == '23':
        suffix = "rd"

    if date[4] == '0':
        return date[9] + day_suffix

    return weekday + day + day_suffix + month_and_year

max_date = " "
max_value = 0
min_date = ""
min_value = 10

url = "https://api.nbp.pl/api/exchangerates/rates/a/chf/2022-01-01/2023-01-01/?format=json"

with urllib.request.urlopen(url_address) as url:
    data = json.load(url)

    days = []
    for row in data["rates"]:
        day = {"date": row["effectiveDate"], "rate": row["mid"]}
        days.append(day)

    peak = max(days, key=lambda day: day["rate"])
    depression = min(days, key=lambda day: day["rate"])

    max_date = datetime.strptime(peak["date"], '%Y-%m-%d').date().strftime("%a %d %b %Y")
    min_date = datetime.strptime(depression["date"], '%Y-%m-%d').date().strftime("%a %d %b %Y")


print(date_format(max_date), peak["rate"])
print(date_format(min_date), depression["rate"])