How do I find the last occurrence index for a certain value in a Pandas Series?
For example, let’s say I have a Series that looks like follows:
s = pd.Series([False, False, True, True, False, False])
And I want to find the last index for a True
value (i.e. index 3), how would you go about it?
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Answer
Use last_valid_index
:
s = pd.Series([False, False, True, True, False, False]) s.where(s).last_valid_index()
Output:
3
Using @user3483203 example
s = pd.Series(['dog', 'cat', 'fish', 'cat', 'dog', 'horse'], index=[*'abcdef']) s.where(s=='cat').last_valid_index()
Output
'd'