📦 br-cpf-cnpj
A Python library for CPF and CNPJ validation and generation, with support for the new alphanumeric CNPJ standard.
✨ Features
- ✅ CPF validation
- ✅ CNPJ validation (numeric and alphanumeric)
- 🔢 Random CPF generator
- 🔡 Random CNPJ generator (numeric or alphanumeric)
- 🧪 Fully tested with pytest
📥 Installation
pip install br-cpf-cnpj
🚀 Usage
Validate CPF
from br_cpf_cnpj import is_valid_cpf
is_valid_cpf("529.982.247-25")
# True
# Validate unmasked CPF
is_valid_cpf("55782724366")
# True
Validate CNPJ
from br_cpf_cnpj import is_valid_cnpj
# Validate numeric CNPJ
is_valid_cnpj("11.222.333/0001-81")
# True
# Validate alphanumeric CNPJ
is_valid_cnpj("2P.76B.MNX/0001-66")
# True
# Validate unmasked CNPJ
is_valid_cnpj("B4ESBMHS000102")
# True
# Validate alphanumeric CNPJ with lowercase letters
is_valid_cnpj("mn.ahm.asb/0001-64")
# True
NOTE: By convention, if the CNPJ contains lowercase letters, it will be converted to uppercase before validation. Thus, the CNPJ mn.ahm.asb/0001-64 is considered valid because it is converted to MN.AHM.ASB/0001-64 during validation.
Generate Random CPF
from br_cpf_cnpj import generate_random_cpf
cpf = generate_random_cpf(masked=True)
print(cpf)
# e.g., "123.456.789-09"
cpf_unmasked = generate_random_cpf(masked=False)
print(cpf_unmasked)
# e.g., "12345678909"
Generate Random CNPJ
from br_cpf_cnpj import generate_random_cnpj
# Generate numeric CNPJ
cnpj_numeric = generate_random_cnpj(alphanumeric=False, masked=True)
print(cnpj_numeric)
# e.g., "12.345.678/0001-95"
# Generate alphanumeric CNPJ
cnpj_alphanumeric = generate_random_cnpj(alphanumeric=True, masked=False)
print(cnpj_alphanumeric)
# e.g., "RSASKDDW000100"
Formatter CPF/CNPJ
from br_cpf_cnpj import format_cpf_cnpj
cpf = "07368395690"
cnpj = "NXBZ38V0000172"
invalid_cpf = "123"
formatted_cpf = format_cpf_cnpj(cpf)
formatted_cnpj = format_cpf_cnpj(cnpj)
formatted_invalid_cpf = format_cpf_cnpj(invalid_cpf)
print(formatted_cpf) # Output: "073.683.956-90"
print(formatted_cnpj) # Output: "NX.BZ3.8V0/0001-72"
print(formatted_invalid_cpf) # Output: "123" (Unchanged because it doesn't match a valid CPF/CNPJ format)
NOTE: The format_cpf_cnpj formatter automatically detects whether the string is a CPF or CNPJ and applies the correct formatting. If the string does not match a valid CPF or CNPJ format, it will be returned unchanged.
🧠 How it works
CPF
- Uses fixed weights (10 → 2, then 11 → 2)
- Applies the official modulo 11 algorithm
- Prevents invalid repeated-digit CPFs (e.g.
11111111111)
CNPJ (Alphanumeric)
- Supports digits (0–9) and uppercase letters (A–Z)
- Characters are converted using:
value = ord(char) - ord('0') - Weights cycle from 2 → 9
🤝 Contributing
Contributions are very welcome!
Development Setup
This project uses uv for dependency management. To set up your development environment:
- Clone the repository
- Install dependencies:
uv sync --extra dev - Run tests:
uv run pytest
📄 License
MIT License.
Versão em Português
📦 br-cpf-cnpj
Uma biblioteca Python para validação e geração de CPF e CNPJ, com suporte ao novo padrão de CNPJ alfanumérico.
✨ Funcionalidades
- ✅ Validação de CPF
- ✅ Validação de CNPJ (numérico e alfanumérico)
- 🔢 Gerador de CPF aleatório
- 🔡 Gerador de CNPJ aleatório (numérico ou alfanumérico)
- 🧪 Testes automatizados com pytest
📥 Instalação
pip install br-cpf-cnpj
🚀 Uso
Validar CPF
from br_cpf_cnpj import is_valid_cpf
is_valid_cpf("529.982.247-25")
# True
# Validar CPF sem máscara
is_valid_cpf("55782724366")
# True
Validar CNPJ
from br_cpf_cnpj import is_valid_cnpj
# Validar CNPJ numérico
is_valid_cnpj("11.222.333/0001-81")
# True
# Validar CNPJ alfanumérico
is_valid_cnpj("2P.76B.MNX/0001-66")
# True
# Validar CNPJ sem máscara
is_valid_cnpj("B4ESBMHS000102")
# True
# Validar CNPJ alfanumérico com letras minúsculas
is_valid_cnpj("mn.ahm.asb/0001-64")
# True
NOTA: Por convenção, se o CNPJ tiver letras minusculas, ele será convertido para maiúsculas antes da validação. Dessa forma, o CNPJ mn.ahm.asb/0001-64 é considerado válido, pois é convertido para MN.AHM.ASB/0001-64 durante a validação.
Gerar CPF Aleatório
from br_cpf_cnpj import generate_random_cpf
cpf = generate_random_cpf(masked=True)
print(cpf)
# e.g., "123.456.789-09"
cpf_unmasked = generate_random_cpf(masked=False)
print(cpf_unmasked)
# e.g., "12345678909"
Gerar CNPJ Aleatório
from br_cpf_cnpj import generate_random_cnpj
# Gerar CNPJ numérico
cnpj_numeric = generate_random_cnpj(alphanumeric=False, masked=True)
print(cnpj_numeric)
# e.g., "12.345.678/0001-95"
# Gerar CNPJ alfanumérico
cnpj_alphanumeric = generate_random_cnpj(alphanumeric=True, masked=False)
print(cnpj_alphanumeric)
# e.g., "RSASKDDW000100"
Formatar CPF/CNPJ
from br_cpf_cnpj import format_cpf_cnpj
cpf = "07368395690"
cnpj = "NXBZ38V0000172"
invalid_cpf = "123"
formatted_cpf = format_cpf_cnpj(cpf)
formatted_cnpj = format_cpf_cnpj(cnpj)
formatted_invalid_cpf = format_cpf_cnpj(invalid_cpf)
print(formatted_cpf) # Saída: "073.683.956-90"
print(formatted_cnpj) # Saída: "NX.BZ3.8V0/0001-72"
print(formatted_invalid_cpf) # Saída: "123" (Permanece inalterado porque não corresponde a um formato válido de CPF/CNPJ)
NOTA: O formatador format_cpf_cnpj detecta automaticamente se a string é um CPF ou CNPJ e aplica a formatação correta. Se a string não corresponder a um formato válido de CPF ou CNPJ, ela será retornada inalterada.
🧠 Como Funciona
CPF
- Pesos fixos (10 → 2 e 11 → 2)
- Algoritmo módulo 11
- Rejeita CPFs inválidos com dígitos repetidos (e.g.
11111111111)
CNPJ (Alfanumérico)
- Aceita números (0–9) e letras (A–Z)
- Conversão baseada em valor ASCII:
value = ord(char) - ord('0') - Pesos cíclicos de 2 → 9
🤝 Contribuindo
Contribuições são muito bem-vindas!
Configuração do Ambiente de Desenvolvimento
Este projeto utiliza uv para gerenciamento de dependências. Para configurar seu ambiente de desenvolvimento:
- Clone o repositório
- Instale as dependências:
uv sync --extra dev - Execute os testes:
uv run pytest
📄 License
MIT License.
Metadata
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