두점 사이 거리구하기

import math


class Point2D:
    def __init__(self, x, y):
        self.x = x
        self.y = y


p1 = Point2D(x=30, y=20)  # 점1
p2 = Point2D(x=60, y=50)  # 점2

a = p2.x - p1.x  # 선 a의 길이
b = p2.y - p1.y  # 선 b의 길이

c = math.sqrt(math.pow(a, 2) + math.pow(b, 2))  
print(c)  # 42.42640687119285

 

 

import math

class Point2D:
    def __init__(self, x=0, y=0):
        self.x = x
        self.y = y


length = 0.0
p = [Point2D(), Point2D(), Point2D(), Point2D()]
p[0].x, p[0].y, p[1].x, p[1].y, p[2].x, p[2].y, p[3].x, p[3].y = map(int, input().split())

def distance(a,b):
    global length
    di = math.sqrt(pow(a.x-b.x,2)+pow(a.y-b.y,2))
    length += di


for i in range(len(p)-1):
    distance(p[i],p[i+1])

print(length)