Python Dataframe Count Unique Values In A Column
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Python Dataframe Count Unique Values In A Column
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How To Get Unique Values From A Dataframe In Python AskPython
To count the unique values of each column of a dataframe you can use the pandas dataframe nunique function The following is the syntax counts df nunique Here df is the dataframe for which you want to know the unique counts It returns a pandas Series of counts A simple solution is df stack value counts However 1 It looks like stack returns a copy not a view which is memory prohibitive in this case Is this correct 2 I want to group the DataFrame by rows and then get the different histograms for each grouping
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