Suppose I have a dataframe where some columns contain a zero value as one of their elements (or potentially more than one zero). I don’t specifically want to retrieve these columns or discard them (I know how to do that) – I just want to locate these. For instance: if there is are zeros somewhere in the 4th, 6th and the 23rd columns, I want a list with the output [4,6,23].
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Answer
You could iterate over the columns, checking whether 0 occurs in each columns values:
[i for i, c in enumerate(df.columns) if 0 in df[c].values]