projektB

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


def date_format(day: str):  # making format of date 'better'
    if day[8:10] == '01':
        return "1st"
    if day[8:10] == '02':
        return "2nd"
    if day[8:10] == '03':
        return "3rd"
    if day[8] == '0':
        return f"{day[9]}th"
    else:
        return f"{day[8:10]}th"


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"

json_url = urlopen(url)
data = json.loads(json_url.read())

for i in range(0, len(data["rates"])):
    if data["rates"][i]["mid"] > max_value:  # finding maximum
        max_value = data["rates"][i]["mid"]
        max_date = data["rates"][i]["effectiveDate"]

    if data["rates"][i]["mid"] < min_value:  # finding minimum
        min_value = data["rates"][i]["mid"]
        min_date = data["rates"][i]["effectiveDate"]

max_date_object = datetime.strptime(max_date, '%Y-%m-%d').date()
min_date_object = datetime.strptime(min_date, '%Y-%m-%d').date()  # string -> date class

print(f"For CHF the maximum value of currency rate was on "
      f"{max_date_object.strftime('%a')} {date_format(max_date)} "
      f"{max_date_object.strftime('%b %Y')} and it was: "
      f"{max_value}[PLN] for 1[CHF]")
print(f"For CHF the minimum value of currency rate was on "
      f"{min_date_object.strftime('%a')} {date_format(min_date)} "
      f"{min_date_object.strftime('%b %Y')} and it was: "
      f"{min_value}[PLN] for 1[CHF]")