Handle Error in Patito¶

Overview¶

Patito will be popular when interage with polars. And handle the error within patito concept is

I will introduce and reprocedure code that will be error

The script of detial https://github.com/kolonialno/patito/blob/main/src/patito/exceptions.py

Flow Concept¶

stateDiagram-v2
    [*] --> Still
    Still --> [*]

    Still --> Moving
    Moving --> Still
    Moving --> Crash
    Crash --> [*]

Component¶

flowchart LR

ty[TypeError]

pv[ValidationError] -- inherit --> pydantic_val[pydantic.ValidationError] -- inherit --> r[Representation]
pydantic_val -- inherit --> biv[Built-in ValueError]
ErrorWrapper -- inherit --> pydantic_val[pydantic.ValidationError] -- inherit --> r

WrongColumnsError

MissingColumnsError

SuperflousColumnsError

MissingValuesError --> biv

ColumnDTypeError --> ty

RowValueError--> biv

RowDoesNotExist --> ty

MultipleRowsReturned

Reprocedure¶

step: Declare Model --> return ValueError


step: Validate --> ValidationError

a) Wrong declaration about schema

Expected:

"""Module containing all custom exceptions raised by patito."""

import pydantic


class ValidationError(pydantic.ValidationError):
    """Exception raised when dataframe does not match schema."""


class ErrorWrapper(pydantic.error_wrappers.ErrorWrapper):
    """Wrapper for specific column validation error."""


class WrongColumnsError(TypeError):
    """Validation exception for column name mismatches."""


class MissingColumnsError(WrongColumnsError):
    """Exception for when a dataframe is missing one or more columns."""


class SuperflousColumnsError(WrongColumnsError):
    """Exception for when a dataframe has one ore more non-specified columns."""


class MissingValuesError(ValueError):
    """Exception for when a dataframe has non-nullable columns with nulls."""


class ColumnDTypeError(TypeError):
    """Exception for when a dataframe has one or more columns with wrong dtypes."""


class RowValueError(ValueError):
    """Exception for when a dataframe has a row with a impermissible value."""


class RowDoesNotExist(RuntimeError):
    """Exception for when a single row was expected, but none were returned."""


class MultipleRowsReturned(RuntimeError):
    """Exception for when a single row was expected, but several were returned."""

Reference¶

https://github.com/kolonialno/patito/blob/main/src/patito/exceptions.py