# openpyxl.utils.exceptions module

Definitions for openpyxl shared exception classes.

exception openpyxl.utils.exceptions.CellCoordinatesException

  Bases: `Exception`

  Error for converting between numeric and A1-style cell references.

exception openpyxl.utils.exceptions.IllegalCharacterError

  Bases: `Exception`

  The data submitted which cannot be used directly in Excel files. It must be removed or escaped.

exception openpyxl.utils.exceptions.InvalidFileException

  Bases: `Exception`

  Error for trying to open a non-ooxml file.

exception openpyxl.utils.exceptions.NamedRangeException

  Bases: `Exception`

  Error for badly formatted named ranges.

exception openpyxl.utils.exceptions.ReadOnlyWorkbookException

  Bases: `Exception`

  Error for trying to modify a read-only workbook

exception openpyxl.utils.exceptions.SheetTitleException

  Bases: `Exception`

  Error for bad sheet names.

exception openpyxl.utils.exceptions.WorkbookAlreadySaved

  Bases: `Exception`

  Error when attempting to perform operations on a dump workbook while it has already been dumped once