df.loc[ ], Label-based indexing, df.iloc[ ], Integer-based indexing, df[condition], Conditional selection, df.dropna(), Remove rows/columns with missing values, df.sort_index(), Sort rows/columns by index, df.sub(), Subtract numeric columns, df.join(), Join DataFrames by index, df.groupby(), Group data by column, df.fillna(), Fill missing values, df.notnull(), Detect non-missing values.

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