num = 0 # 初始化num用于存放偶数和
for i in range(0, 1001, 1): # 利用range从0开始循环到1001，每次递增1，循环到1001等同于i<=1000
if i % 2 != 0: # 如果i除以2的余数不为0则说明i不能被2整除，此时i的值为奇数
continue # 不能被整除则跳过当前循环
num += i # 将i的值存到num中
print(num) # 输出num的值，也就是1000以内所有偶数的值
template = 'Life is {0},you need {1}'
result = template.format('short','python')
print(result)
template = 'Life is {s} , you need {p}'
short ='short'
python = 'python'
result = template.format(s =short , p = python)
print(result)
