DOC:

[alexandermorgan]

Pandas version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

pandas.Series.first_valid_index

pandas/pandas/core/generic.py

Line 12341 in ba1cccd

If all elements are non-NA/null, returns None.

Documentation problem

pandas/pandas/core/generic.py

Line 12341 in ba1cccd

If all elements are non-NA/null, returns None.

The "Notes" passage reads: "If all elements are non-NA/null, returns None. Also returns None for empty Series/DataFrame."
but the "non-" should not be there.

Suggested fix for documentation

The "non-" should be deleted from the "Notes" section, resulting in this:
"If all elements are NA/null, returns None. Also returns None for empty Series/DataFrame."

[jfadia]

take

[jfadia]

My understanding:

• The function is trying to return the first valid (i.e. non-NA and non-null) index in the series/frame
• The docs say that if all elements are non-NA/null, returns None, which would imply that we would return None if all elements are non-null, which I believe was not the intent

I will update this to remove the "non-" from that line. Thanks!