py-flow-rules 0.1.0

A simple rules engine package for python

py flow rules

A simple rules engine implementation for python.

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Features

• Allows the developer to write simple rules policies to aggregate the business logic for an application.

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Installation

Clone this repository and install the necessary dependencies.

git clone https://github.com/p1971/pyFlowRules.git
cd pyFlowRules
python -m venv .venv
source .venv/bin/activate  # On Windows use: .\.venv\Scripts\activate

# For core functionality only (no dependencies required):
pip install -e .

# For development (includes testing tools):
pip install -r requirements-dev.txt

# For running examples:
pip install -r requirements-examples.txt

Make sure you have Python 3.10 or above installed.

Versioning

This project follows Semantic Versioning. Version numbers are in the format MAJOR.MINOR.PATCH:

• MAJOR version for incompatible API changes
• MINOR version for added functionality in a backwards compatible manner
• PATCH version for backwards compatible bug fixes

Current version:

Requirements Files

The project uses separate requirements files for different purposes:

• requirements.txt - Core dependencies (currently empty as we only use standard library)
• requirements-dev.txt - Development dependencies (pytest, coverage, etc.)
• requirements-examples.txt - Dependencies for running example code

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Usage

Here is an example of how to use the project:

from dataclasses import dataclass

from flowrules.rules_engine import policy, rule, Policy

@dataclass
class Request:
    id: int
    notional: float
    client: str
    
@policy(policy_id="P01", policy_name="InitialRequestValidation")
class InitialRequestPolicy(Policy):
    @rule(rule_id="R001", rule_name="Validate notional", failure_message="The notional is too high.")
    def validate_notional(self, r: Request):
        return r.notional < 100000
    
    @rule(rule_id="R002", rule_name="Validate client", failure_message="The client is unknown.")
    def validate_client(self, r: Request):
        return r.client in ["client1", "client2"]
  

policy = InitialRequestPolicy()
result = policy.execute(Request(id=1, notional=90000, client="client1"))
print(result)

You can find more examples in the examples/ directory. For example

python -m example.main

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Running Tests

Unit tests are included for this project. Use pytest to run them (recommended):

pip install pytest  # Install pytest if not already done
pytest

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Contributing

Contributions are welcome! Please follow these steps to contribute:

1. Fork the repository.
2. Create a new branch (git checkout -b feature/your-feature).
3. Commit your changes (git commit -m 'Add some feature').
4. Push your branch (git push origin feature/your-feature).
5. Open a pull request.

Make sure your code passes all tests and follows Python best practices.

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License

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

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