python 的技巧

pi = 0
n = 100
for k in range(n):
    pi+=1/pow(16,k)*(\  #一行不够写或不易读时用\,则多行与一行一样
        4/(8*k+1)-2/(8*k+4)-\
        1/(8*k+5) -1/(8*k+6))
print("圆周率: {}".format(pi))

输入

a,b = input().split()
a+=b
print(a)
 -
-
a,b,c=map(eval,input().split())
a+=b
print(a,c)
0.3 1.5
1.8