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.