DataFrame.stack()
pandas.DataFrame.stack
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DataFrame.stack(level=-1, dropna=True) -
Pivot a level of the (possibly hierarchical) column labels, returning a DataFrame (or Series in the case of an object with a single level of column labels) having a hierarchical index with a new inner-most level of row labels. The level involved will automatically get sorted.
Parameters: level : int, string, or list of these, default last level
Level(s) to stack, can pass level name
dropna : boolean, default True
Whether to drop rows in the resulting Frame/Series with no valid values
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