Python: most efficient way to convert date to datetime

问题

In Python, I convert a date to datetime by:

1. converting from date to string
2. converting from string to datetime

Code:

import datetime
dt_format="%d%m%Y"
my_date = datetime.date.today()
datetime.datetime.strptime(my_date.strftime(dt_format), dt_format)

I suspect this is far from the most efficient way to do this. What is the most efficient way to convert a date to datetime in Python?

回答1:

Use datetime.datetime.combine() with a time object, datetime.time.min represents 00:00 and would match the output of your date-string-datetime path:

datetime.datetime.combine(my_date, datetime.time.min)

Demo:

>>> import datetime
>>> my_date = datetime.date.today()
>>> datetime.datetime.combine(my_date, datetime.time.min)
datetime.datetime(2013, 3, 27, 0, 0)

回答2:

Alternatively, as suggested here, this might be more readable:

datetime(date.year, date.month, date.day)

来源：https://stackoverflow.com/questions/15661013/python-most-efficient-way-to-convert-date-to-datetime