Cargo Features

[dependencies]
ggca = { version = "1.0.0", default-features = false, features = ["extension-module"] }
default = extension-module

This prevent errors with get/set macro Read this https://github.com/PyO3/pyo3/issues/1084 Solved using this: https://pyo3.rs/master/faq.html#i-cant-run-cargo-test-im-having-linker-issues-like-symbol-not-found-or-undefined-reference-to-_pyexc_systemerror It will be fixed once https://github.com/PyO3/pyo3/pull/1123 is merged

extension-module default

Enables pyo3