函数

import  time
def logger():
    time_format = '%Y-%m-%d %X'
    time_current = time.strftime(time_format)
    with open('a.txt','a+') as f:
        f.write('%s end action
' %time_current)
def test1():
    print('in the test1')
    logger()
def test2():
    print('in the test2')
    logger()
def test3():
    print('in the test3')
    logger()

test1()
test2()
test3()

2018-11-06 11:32:07 end action
2018-11-06 11:32:07 end action
2018-11-06 11:32:07 end action