zad5.py

import json, math
# Напишите ваш код ниже
with open("data/covid.json") as a:
    dane = json.load(a)
from datetime import datetime

def calc_mean_sigma(data):
    sx, sx2, n = 0.0, 0.0, 0
    for x in data:
        sx += x
        sx2 += x*x
        n += 1
    return (sx / n, math.sqrt(max(sx2 / n - sx / n * sx / n, 0)))

def sigma_norm (country_code, value_name):
    out= []
    temp= dane[country_code]['data']
    N = len(temp)
    
    for i in range(N):
        datestring=dane[country_code]['data'][i]['date']
        dt = datetime.strptime(datestring, '%Y-%m-%d')
        x = dane[country_code]['data'][i][value_name]
        x = float(x)
        if dt.month==8:
        
            out.append(x)
    n = len(out)
    mean = sum(out)/n
    return float(calc_mean_sigma(out)[1])/mean