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Tag: cumulative-sum

what is the best way to create running total columns in pandas

What is the most pandastic way to create running total columns at various levels (without iterating over the rows)? input: output: The test column can only contain X’s or NaNs. The number of consecutive X’s is random. In the ‘desired_output_level_1’ column, trying to count up the number of series of X’s. In the ‘desired_output_level_2’ column, trying to find the duration

How do you cumulatively aggregate string in pandas?

I have a column that contains strings. I want to cumulatively aggregate the string through the y-axis. This is the desired output. Something like this can be achieved using the expanding or cumsum() function, however it appears to work for numeric attributes only. Answer a quick idea output: or just: output:

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