a="Python等级考试" 

b="="

c=">"

print("{0:{1}{3}{2}}".format(a,b,25,c))

import time 

t = time.gmtime() 

print(time.strftime("%Y-%m-%d %H:%M:%S",t))

a = [[1,2,3], [4,5,6], [7,8,9]]

s = 0

for c in a:

    for j in range(3):

       s += c[j]

print(s)

txt = open("book.txt", "r")

print(txt.read())

txt.close()