[ Python 常見問題 ] How can I convert a datetime object to milliseconds since epoch (unix time) in Python

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Question
I have a Python datetime object that I want to convert to unix time, or seconds/milliseconds since the 1970 epoch.

How-To
It appears to me that the simplest way to do this is:
- test.py

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1. from datetime import datetime  
2. import time  
3.   
4. epoch = datetime.datetime.utcfromtimestamp(0)  
5.   
6. def unix_time_millis(dt):  
7.     return (dt - epoch).total_seconds() * 1000.0  
8.   
9. def unix_time_sec(dt):  
10.     return (dt - epoch).total_seconds()  

Let's test it:

>>> from test import *
>>> now = datetime.now()
>>> now
datetime.datetime(2017, 2, 23, 0, 30, 54, 160342)
>>> e = unix_time_sec(now) # Retrieve seconds since epoch
>>> e
1487809854.160342
>>> dt = datetime(*time.localtime(e)[:-3]) # Translate seconds since epoch back to datetime object
>>> dt
datetime.datetime(2017, 2, 23, 8, 30, 54)