python 格式化打印

#coding=utf-8

import time;

start_time = time.time()
for a in range(0,1001):
for b in range(0,1001):
for c in range(0,1001):
if (a + b + c == 1000 and a**2 + b**2 == c**2):
print ("a=%d,b=%d,c=%d" %(a,b,c))
end_time = time.time()
print(end_time - start_time)