Question

Find latitude and longitude of utmost 20 countries,ordered by population greater or equal to the population limit given below and have atleast one currency exclusively for themselves.(countries like Madagascar,sri Lanka but not India,USA).

Answer 1

import json
from math import pi, sin, cos, sqrt, asin

def find_dist(latlng_1, latlng_2):
    lat1, lon1 = latlng_1[0]*pi/180, latlng_1[1]*pi/180
    lat2, lon2 = latlng_2[0]*pi/180, latlng_2[1]*pi/180
    d = 2*6371*asin(sqrt(sin((lat2-lat1)/2)**2 + cos(lat1)*cos(lat2)*sin((lon2-lon1)/2)**2))
    return round(d,2)

file = "path/new 1.json"

limit = 31028700

with open(file, 'r') as f:
    contries = json.load(f)
first_20 = {}
for contry in contries:
    if contry['population'] >= limit:
        first_20[contry['alpha3Code']] = contry['latlng']
        if len(first_20) == 20:
            break

total_dist = 0
keys = list(first_20.keys())
for i in range(len(keys)-1):
    for j in range(len(keys[i+1:])):
        total_dist += find_dist(first_20[keys[i]], first_20[keys[j]])
total_dist = round(total_dist, 2)

print(total_dist)