https://stackoverflow.com/questions/32019556/matplotlib-crashing-tkinter-application/34109240#34109240

Install the virtualenv package:

pip install virtualenv

Create the virtual environment:

virtualenv mypython

Create the virtual environment with specifying path:

virtualenv -p /usr/bin/python3 mypython

Activate the virtual environment:

source mypython/bin/activate

Deactivate the virtual environment:

deactivate

Save all the packages in the file:

pip freeze > requirements.txt

convert date long to date:

from datetime import datetime
>>> datetime.utcfromtimestamp(1605139199)
datetime.datetime(2020, 11, 11, 23, 59, 59)

get long value:

import datetime, time
>>> time.mktime(datetime.datetime(2020, 11, 19, 10, 00, 00).timetuple())