How To Apply Query To A DataFrame? Table Of Contents: Syntax ‘query( )’ Method In Pandas. Examples ‘query( )’ Method. (1) Syntax: DataFrame.query(expr, *, inplace=False, **kwargs) Description: Query the columns of a DataFrame with a boolean expression. Parameters: expr: str – The query string to evaluate. You can refer to variables in the environment by prefixing them with an ‘@’ character like @a + b. You can refer to column names that are not valid Python variable names by surrounding them in backticks.  Thus, column names containing spaces or punctuations (besides underscores) or starting with digits must be surrounded by backticks. (For example,

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