创建使用模块与datetime模块使用

#!/usr/bin/python
name = ‘my first module ‘
def print_name():
    nama= raw_input(‘what is your name?\n‘)
    print ‘hello,‘,name
    return

__all__ = [‘module_13‘, ‘module_12‘]   ##模块元素名

if __name__ == ‘__main__‘:  ##如果手动执行 __name__方法为__main__，则执行函数，
    query()

>>> import first_module       ##导入
>>> dir(first_module)            ##查看属性，方法
[‘__builtins__‘, ‘__doc__‘, ‘__file__‘, ‘__name__‘, ‘__package__‘, ‘name‘, ‘print_name‘]
>>> first_module.print_name()       ##执行.print_name()方法
what is your name?
laing
hello, my first module 
>>> 

>>> from datetime import datetime
>>> now = datetime.now()       # 获取当前datetime
>>> print(now)
2017-11-09 23:50:41.356000
>>> print(type(now))
<class ‘datetime.datetime‘>

from datetime import datetime, timedelta
string = ‘2017-11-09 23:50:41‘
time1 = datetime.strptime(string, ‘%Y-%m-%d %H:%M:%S‘)
print(time1)
print(type(time1))
结果：
2017-11-09 23:50:41
<type ‘datetime.datetime‘>

from datetime import datetime, timedelta
string = ‘2017-11-09 23:50:41‘
time1 = datetime.strptime(string, ‘%Y-%m-%d %H:%M:%S‘)
print(time1)
print(type(time1))
time1_str = datetime.strftime(time1, ‘%Y-%m-%d %H:%M:%S‘)
print(type(time1_str))
print(time1_str)
结果：
2017-11-09 23:50:41
<type ‘datetime.datetime‘>
<type ‘str‘>
2017-11-09 23:50:41

from datetime import datetime, timedelta
import time
time1 = time.time()
print(time1)
time1_str = datetime.fromtimestamp(time1)
print(time1_str)
print(type(time1_str))
结果：
1493107955.66
2017-11-09 23:50:41.660000
<type ‘datetime.datetime‘>