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DS Tool toys (Pandas (Reshape (Concat axis=0: rows axis=1: cols, pivot,…

- - - - isin, isnull, isna, ==
      - loc, iloc, at, iat
      - Indexing view vs copy
        
        Why does assignment fail when using chained indexing?
        
        The results is unpredictable
        Use loc[x, y] instead of [x][y]
  - - - Naming
        df = data.groupby(...).agg(...) df.columns = df.columns.droplevel(0) # OR df.columns = ["_".join(x) for x in df.columns.ravel()]
        
        you can use the ravel() function on the multi-level column to form new labels: