func-validator 0.16.0

MATLAB-style function argument validation for Python - clean, simple, and reliable.

func-validator

MATLAB-style function argument validation for Python - clean, simple, and reliable.

Table of Contents

• Installation
• Imports
• Usage
• Validators
• License

Installation

pip install func-validator

Imports

• Import for the function decorator

  from func_validator import validate_params
  from func_validator import validate_func_args
  from func_validator import validate_func_args_at_runtime 
  

[!NOTE] validate_params is a function decorator that validates function arguments at runtime. validate_func_args and validate_func_args_at_runtime are alias for validate_params.

• Import for the validators

  from func_validator import MustBeGreaterThan, MustMatchRegex 
  from func_validator.validators.numeric_arg_validators import MustBeGreaterThan
  

  There are 3 other modules you can import validators from, namely:

  • collection_arg_validators
  • datatype_arg_validators
  • text_arg_validators

[!NOTE] All validator objects (functions/callables) can be imported from the func_validator namespace

Usage

from typing import Annotated
from func_validator import validate_params
from func_validator.validators.numeric_arg_validators import (MustBePositive,
                                                              MustBeNegative)


@validate_params
def func(a: Annotated[int, MustBePositive],
         b: Annotated[float, MustBeNegative]):
    return (a, b)


func(10, -10)   # ✅ Correct

func(-10, -10)  # ❌ Wrong -10 is not positive and 10 is not negative
# A validation error is raised with a message.

func(0, -10)    # ❌ Wrong 0 is not positive
# A validation error is raised with a message.

func(20, 10)    # ❌ Wrong 10 is not negative
# A validation error is raised with a message.

Validators

This is not the exhaustive list for all validators, checkout the docs for more examples.

Collection Validators

MustBeMemberOf	Validate that argument value is in a collection
MustBeEmpty	Validate that argument value is empty

DataType Validators

MustBeA

Validates that the value is of the specified type

Numeric Validators

MustBePositive	Validate that argument value is positive
MustBeNegative	Validate that argument value is negative

Text Validators

MustMatchRegex

Validates that the value matches the provided regular expression.

License

MIT License