# ETH 2.0 PySpec

The Python executable spec is built from the ETH 2.0 specification, 
 complemented with the necessary helper functions for hashing, BLS, and more.

With this executable spec,
 test-generators can easily create test-vectors for client implementations,
 and the spec itself can be verified to be consistent and coherent, through sanity tests implemented with pytest.


## Building

All the dynamic parts of the spec can be build at once with `make pyspec`.

Alternatively, you can build a sub-set of the pyspec: `make phase0`.

Or, to build a single file, specify the path, e.g. `make test_libs/pyspec/eth2spec/phase0/spec.py`


## Py-tests

After building, you can install the dependencies for running the `pyspec` tests with `make install_test`

These tests are not intended for client-consumption.
These tests are sanity tests, to verify if the spec itself is consistent.

### How to run tests

#### Automated

Run `make test` from the root of the spec repository.

#### Manual

From within the `pyspec` folder:

Install dependencies:
```bash
python3 -m venv venv
. venv/bin/activate
pip3 install -r requirements-testing.txt
```
Note: make sure to run `make -B pyspec` from the root of the specs repository,
 to build the parts of the pyspec module derived from the markdown specs.
The `-B` flag may be helpful to force-overwrite the `pyspec` output after you made a change to the markdown source files.

Run the tests:
```
pytest --config=minimal eth2spec
```
Note the package-name, this is to locate the tests.


## Contributing

Contributions are welcome, but consider implementing your idea as part of the spec itself first.
The pyspec is not a replacement.


## License

Same as the spec itself, see [LICENSE](../../LICENSE) file in spec repository root.