cpf-val 2.0.0

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A Python utility to validate CPF (Brazilian Individual's Taxpayer ID).

Python Support

Passing ✔	Passing ✔	Passing ✔	Passing ✔	Passing ✔

Features

• ✅ Fixed 11-digit CPF: Validates the standard 11-digit Brazilian CPF via the official modulo-11 algorithm
• ✅ Flexible input: Accepts str or a sequence of str; sequence elements are concatenated in order
• ✅ Format agnostic: Strips every non-digit character before validation
• ✅ Repeated-digit rejection: All-identical-digit CPFs (e.g. 111.111.111-11, 00000000000) are rejected
• ✅ Typed input validation: Dedicated TypeError subclass for invalid input type
• ✅ Minimal dependencies: cpf-dv for check-digit calculation and lacus.utils for type descriptions in error messages
• ✅ Dual API style: Object-oriented (CpfValidator) and functional (cpf_val())

Installation

$ pip install cpf-val

Import

from cpf_val import CpfValidator, cpf_val

Quick start

from cpf_val import CpfValidator

validator = CpfValidator()

validator.is_valid('12345678909')       # True
validator.is_valid('123.456.789-09')    # True
validator.is_valid('12345678910')       # False (invalid check digits)
validator.is_valid('00000000000')       # False (repeated digits)

Functional helper:

from cpf_val import cpf_val

cpf_val('12345678909')      # True
cpf_val('123.456.789-09')   # True
cpf_val('12345678910')      # False

Usage

The main entry points are the class CpfValidator and the helper cpf_val().

CpfValidator

• __init__: Takes no arguments. CPF validation has no configuration options.

• is_valid(cpf_input): Validates a CPF value.

  Input is normalized to a string (sequences of strings are concatenated). Every non-digit character is then stripped. If the sanitized length is not exactly 11, its base is an all-identical-digit sequence, or the check digits do not match (CpfCheckDigits from cpf-dv), the method returns False — no exception is thrown for validation failure.

  If the input is not a str or a sequence of str, CpfValidatorInputTypeError is raised.

from cpf_val import CpfValidator

validator = CpfValidator()

validator.is_valid('123.456.789-09')             # True
validator.is_valid('12345678909')                # True
validator.is_valid(['123', '456', '789', '09'])  # True
validator.is_valid('12345678910')                # False (invalid check digits)
validator.is_valid('11111111111')                # False (repeated digits)

Functional helper

cpf_val() builds a new CpfValidator and calls is_valid(cpf_input) once. It takes only the input value:

from cpf_val import cpf_val

cpf_val('11144477735')      # True
cpf_val('111.444.777-35')   # True
cpf_val('11144477736')      # False

Input formats

String: Plain digits or a formatted CPF (e.g. 123.456.789-09, 499.784.420-90, 011_258_960_00). Non-digit characters are stripped before validation; the result must be exactly 11 digits.

Sequence of strings: Each element must be a str; values are concatenated (e.g. per digit, grouped segments, or mixed with punctuation). Non-string elements raise CpfValidatorInputTypeError.

from cpf_val import cpf_val

cpf_val(['1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '9'])  # True
cpf_val(['123.456', '789-09'])  # True

Errors & exceptions

This package uses TypeError for invalid input types. Validation failures (wrong length, ineligible base such as repeated digits, invalid check digits) return False and do not throw.

• Wrong input type (not str or a sequence of str): CpfValidatorInputTypeError — extends CpfValidatorTypeError (extends built-in TypeError).
• CpfValidatorException: base for non-type (business) errors; currently has no concrete subclass in this package.

from cpf_val import (
    CpfValidatorInputTypeError,
    CpfValidatorTypeError,
    cpf_val,
)

# Input type (e.g. integer not allowed)
try:
    cpf_val(12345678909)
except CpfValidatorInputTypeError as e:
    print(e)  # CPF input must be of type string or string[]. Got integer number.

# Any type error from the package
try:
    cpf_val(None)
except CpfValidatorTypeError as e:
    pass  # handle

API

Exports

All public symbols are available from the cpf_val package:

• cpf_val: (cpf_input: CpfInput) -> bool — convenience helper.
• CpfValidator: Class to validate CPF (no options); accepts CpfInput in is_valid().
• CPF_LENGTH: 11 (constant).
• CpfInput: Type alias — str | Sequence[str].
• Exceptions: CpfValidatorTypeError, CpfValidatorInputTypeError, CpfValidatorException.

Contribution & Support

We welcome contributions! Please see our Contributing Guidelines for details. If you find this project helpful, please consider:

• ⭐ Starring the repository
• 🤝 Contributing to the codebase
• 💡 Suggesting new features
• 🐛 Reporting bugs

License

This project is licensed under the MIT License — see the LICENSE file for details.

Changelog

See CHANGELOG for a list of changes and version history.

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