Code Room
Code reviewMedium
Question
Review this input check that should allow only digits.
What a strong answer looks like
Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix — specific and kind.
Learn the concepts
import reif re.match(r'\d+', user_id): process(user_id)Run or narrate your approach, then ask the coach.