python - Pandas isna() and isnull(), what is the difference?

Question

Pandas has both isna() and isnull(). I usually use isnull() to detect missing values and have never met the case so that I had to use other than that. So, when to use isna()?

Answer 1

isnull is an alias for isna. Literally in the code source of pandas:

isnull = isna

Indeed:

>>> pd.isnull
<function isna at 0x7fb4c5cefc80>

So I would recommend using isna.