UnknownColumnNameError

Bases: KeyError

Exception raised for trying to access an invalid column name.

Parameters:

Name	Type	Description	Default
column_names	list[str]	The name of the column that was tried to be accessed.	required

Source code in src/safeds/exceptions/_data.py

class UnknownColumnNameError(KeyError):
    """
    Exception raised for trying to access an invalid column name.

    Parameters
    ----------
    column_names : list[str]
        The name of the column that was tried to be accessed.
    """

    def __init__(self, column_names: list[str], similar_columns: list[str] | None = None):
        class _UnknownColumnNameErrorMessage(
            str,
        ):  # This class is necessary for the newline character in a KeyError exception. See https://stackoverflow.com/a/70114007
            def __repr__(self) -> str:
                return str(self)

        error_message = f"Could not find column(s) '{', '.join(column_names)}'."

        if similar_columns is not None and len(similar_columns) > 0:
            error_message += f"\nDid you mean '{similar_columns}'?"

        super().__init__(_UnknownColumnNameErrorMessage(error_message))

__init__(column_names, similar_columns=None)

Source code in src/safeds/exceptions/_data.py

def __init__(self, column_names: list[str], similar_columns: list[str] | None = None):
    class _UnknownColumnNameErrorMessage(
        str,
    ):  # This class is necessary for the newline character in a KeyError exception. See https://stackoverflow.com/a/70114007
        def __repr__(self) -> str:
            return str(self)

    error_message = f"Could not find column(s) '{', '.join(column_names)}'."

    if similar_columns is not None and len(similar_columns) > 0:
        error_message += f"\nDid you mean '{similar_columns}'?"

    super().__init__(_UnknownColumnNameErrorMessage(error_message))