call-datetime-strptime-without-zone (DTZ007)#
Derived from the flake8-datetimez linter.
What it does#
Checks for uses of datetime.datetime.strptime()
that lead to naive
datetime objects.
Why is this bad?#
Python datetime objects can be naive or timezone-aware. While an aware object represents a specific moment in time, a naive object does not contain enough information to unambiguously locate itself relative to other datetime objects. Since this can lead to errors, it is recommended to always use timezone-aware objects.
datetime.datetime.strptime()
without %z
returns a naive datetime
object. Follow it with .replace(tzinfo=)
or .astimezone()
.
Example#
Instead, use .replace(tzinfo=)
:
import datetime
datetime.datetime.strptime("2022/01/31", "%Y/%m/%d").replace(
tzinfo=datetime.timezone.utc
)
Or, use .astimezone()
:
import datetime
datetime.datetime.strptime("2022/01/31", "%Y/%m/%d").astimezone(datetime.timezone.utc)
On Python 3.11 and later, datetime.timezone.utc
can be replaced with
datetime.UTC
.