Mistakes Summary

I’m writing this post to summarize all the mistakes I’ve been making for several times. You know what? They just don’t come into my mind!

1. Don’t create mutable objects by *

❌

sums = [[0] * number_of_experiments] * number_of_participants

⭕

sums = [[0] * number_of_experiments for _ in range(number_of_participants)]

When multiply inner lists by *, only the reference of that single inner list will be copied multiple times instead of creating new lists.