Exceptions

Errors

`PolarsError`	Base class for all Polars errors.
`ColumnNotFoundError`	Exception raised when a specified column is not found.
`ComputeError`	Exception raised when Polars could not perform an underlying computation.
`DuplicateError`	Exception raised when a column name is duplicated.
`InvalidOperationError`	Exception raised when an operation is not allowed (or possible) against a given object or data structure.
`ModuleUpgradeRequiredError`	Exception raised when a module is installed but needs to be upgraded.
`NoDataError`	Exception raised when an operation cannot be performed on an empty data structure.
`NoRowsReturnedError`	Exception raised when no rows are returned, but at least one row is expected.
`OutOfBoundsError`	Exception raised when the given index is out of bounds.
`ParameterCollisionError`	Exception raised when the same parameter occurs multiple times.
`RowsError`	Exception raised when the number of returned rows does not match expectation.
`SQLInterfaceError`	Exception raised when an error occurs in the SQL interface.
`SQLSyntaxError`	Exception raised from the SQL interface when encountering invalid syntax.
`SchemaError`	Exception raised when an unexpected schema mismatch causes an error.
`SchemaFieldNotFoundError`	Exception raised when a specified schema field is not found.
`ShapeError`	Exception raised when trying to perform operations on data structures with incompatible shapes.
`StringCacheMismatchError`	Exception raised when string caches come from different sources.
`StructFieldNotFoundError`	Exception raised when a specified Struct field is not found.
`TooManyRowsReturnedError`	Exception raised when more rows than expected are returned.
`UnsuitableSQLError`	Exception raised when unsuitable SQL is given to a database method.

Warnings

`PolarsWarning`	Base class for all Polars warnings.
`CategoricalRemappingWarning`	Warning issued when a categorical needs to be remapped to be compatible with another categorical.
`ChronoFormatWarning`	Warning issued when a chrono format string contains dubious patterns.
`CustomUFuncWarning`	Warning issued when a custom ufunc is handled differently than numpy ufunc would.
`DataOrientationWarning`	Warning issued to indicate row orientation was inferred from the inputs.
`MapWithoutReturnDtypeWarning`	Warning issued when `map_elements` is performed without specifying the return dtype.
`PerformanceWarning`	Warning issued to indicate potential performance pitfalls.
`PolarsInefficientMapWarning`	Warning issued when a potentially slow `map_*` operation is performed.
`UnstableWarning`	Warning issued when unstable functionality is used.

Panic

PanicException

Exception raised when an unexpected state causes a panic in the underlying Rust library.

© 2020 Ritchie Vink
© 2022 Polars contributors
Licensed under the MIT License.
https://docs.pola.rs/api/python/stable/reference/exceptions.html