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Pandas DataFrame.query()

Pandas DataFrame.query() with What is Python Pandas, Reading Multiple Files, Null values, Multiple index, Application, Application Basics, Resampling, Plotting the data, Moving windows functions, Series, Read the file, Data operations, Filter Data etc.

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Pandas DataFrame.query()

For analyzing the data, we need a lot of filtering operations. Pandas provide a query() method to filter the DataFrame.

It offers a simple way of making the selection and also capable of simplifying the task of index-based selection.

Syntax

DataFrame.query(expr, inplace=False, **kwargs)

Parameters

  • expr: Refers to an expression in string form to filter data.
  • inplace: If the value is True, it makes the changes in the original DataFrame.
  • kwargs: Refers to the other keyword arguments.

Return

It returns a DataFrame that results from the query expression.

Note: This method only works if the column name doesn't have any empty spaces. You can replace the spaces in column names with '_'

Example1

info = pd.DataFrame({'X': range(1, 6),
                    'Y': range(10, 0, -2),
                    'Z Z': range(10, 5, -1)})
info
info.query('X > Y')
info[info.X > info.Y]
info[info.Y == info['Z Z']]

Output

	X	Y			Z Z
0	1	10			10
Next TopicDataFrame.rename()




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