benchmark_parsing_datetime.py

import timeit
from datetime import datetime
from dateutil import parser as dateutil_parser
from backports.datetime_fromisoformat import datetime_fromisoformat  # backport for python < 3.7


strformat = "%Y-%m-%dT%H:%M:%S.%f"


def main():
    datetime_now = datetime.utcnow()
    str_now = datetime_now.isoformat()  # ISO 8601

    assert dateutil_parser.parse(str_now) == datetime_now
    assert dateutil_parser.isoparse(str_now) == datetime_now
    assert datetime.strptime(str_now, strformat) == datetime_now
    assert datetime_fromisoformat(str_now) == datetime_now

    timeit_globals = {
        'datetime': datetime,
        'dateutil_parser': dateutil_parser,
        'datetime_fromisoformat': datetime_fromisoformat,
        'strformat': strformat,
        'str_now': str_now,
    }
    number = 10000

    print(timeit.timeit("dateutil_parser.parse(str_now)",
                        globals=timeit_globals, number=number))
    print(timeit.timeit("dateutil_parser.isoparse(str_now)",
                        globals=timeit_globals, number=number))
    print(timeit.timeit("datetime.strptime(str_now, strformat)",
                        globals=timeit_globals, number=number))
    print(timeit.timeit("datetime_fromisoformat(str_now)",
                        globals=timeit_globals, number=number))


if __name__ == '__main__':
    main()

    
"""
$ python3 python_parsing_datetime.py 
0.6838104360003854
0.09205088900034752
0.09850840099989
0.001140635000410839

"""