LowFile-scopePython Plug & play

Use timezone-aware datetime objects

Store and compare datetimes as timezone-aware (UTC). Convert to local time only at the edges (UI/IO).

Why this matters

Avoids subtle bugs with DST/offset math and makes comparisons reliable.

Side-by-side examples engineers can pattern-match during review.

Avoid

from datetime import datetime
expires_at = datetime.now()  # naive

Prefer

from datetime import datetime, timezone
expires_at = datetime.now(timezone.utc)

Bad

datetime.utcnow()

Good

datetime.now(timezone.utc)

From the same buckets as this rule.

Critical
Avoid Redundant `None` Comparisons
Identify cases where `x is None` or `x is not None` is used redundantly when `x` is always or never `None`. This may indicate a deeper logic issue.
duplication-complexityreadability-refactor+1
Critical
Avoid Using Boolean Expressions in `except` Statements
Detect `except` clauses that use `or` or `and` to catch multiple exceptions. This does not work as intended. Recommend using a tuple of exceptions instead.
error-handlingstack-python
Critical
Don’t Create Exceptions Without Raising Them
Identify instances where an exception object is created but never raised. This is likely an oversight and should either be removed or properly raised.
error-handlingstack-python