python3 datetime.timestamp in python2?

问题

I have a piece of python3 code, that calls a function at 22:00.

# Imports
from datetime import datetime, date, time, timedelta
import sched
import time as mod_time

# Find the next datetime corresponding to 22:00
first_run = datetime.combine(date.today(), time(22,0))
first_run = first_run if first_run > datetime.now() else first_run + timedelta(1)

# Dumb test function
def my_function():
    print('my_function')

# Run the function at 22:00
scheduler = sched.scheduler(mod_time.time, mod_time.sleep)
scheduler.enterabs(first_run.timestamp(), 1, my_function, ())
scheduler.run()

This code is currently working in python3. I would like it to work in python2. My only problem comes from the following:

first_run.timestamp()

I tried to replace it with something like:

(first_run - datetime(1970, 1, 1)).total_seconds()

But there seems to be a problem with my timezone (UTC would be too easy, I'm in UTC+2). There should be something with tzinfo in first_run. Maybe I should add something?

I'm quite lost, and any help would be appreciated. Thanks a lot by advance for helping me.

EDIT1:

After Haochen Wu's comment, I've read Convert datetime to Unix timestamp and convert it back in python

Now I know that the following lines are equivalent for me:

(datetime.now() - datetime(1970, 1, 1)).total_seconds()
(datetime.now() - datetime.utcfromtimestamp(0)).total_seconds()

The solution should be

(datetime.now() - datetime.fromtimestamp(0)).total_seconds()

But this is not the case. This value is still different from mod_time.time().

Maybe because of winter/summer hours?

回答1:

use the following to convert to a timestamp in python 2

int((mod_time.mktime(first_run.timetuple())+first_run.microsecond/1000000.0))

回答2:

use time.time() in python2, it's analog to datetime.timestamp() in python3

datetime.datetime.timestamp

IF you need for current datetime realization, see implementation of that in python3:

def timestamp(self):
    "Return POSIX timestamp as float"
    if self._tzinfo is None:
        return _time.mktime((self.year, self.month, self.day,
                             self.hour, self.minute, self.second,
                             -1, -1, -1)) + self.microsecond / 1e6
    else:
        return (self - _EPOCH).total_seconds()

where _EPOCH = datetime(1970, 1, 1, tzinfo=timezone.utc)

来源：https://stackoverflow.com/questions/30020988/python3-datetime-timestamp-in-python2

标签

python

python-3.x

python-2.x