隔一秒输出一个:

import time
 myd={1:'a',2:'b'}
 for key,value in dict.items(myd):
     print(key,value)
     time.sleep(1)

隔一秒格式化输出当下时间:

import time
 while True:
     print(time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())))
     time.sleep(1)
     #print(time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())))