Answer to Question #277472 in HTML/JavaScript Web Application for Bibin

Question

Find latitude and longitude of 20 countries with a population greater than or equal to the population limit given below. Use the country details from this dataset.

Your task is to find the sum of the length of all lines (in kms) that can be drawn between co-ordinates of these countries.

Answer 1

Population limit: 28875

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



def find_dist(latlng_1, latlng_2):
	'''
	This function calculate distanse in km between two point on Earth
	whose coordinates are passed as two lists and returns rounded distanse
	'''
	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 = "countriesV2.json"


limit = 11750


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_)