Wrapping the Rust MatchSpec in Python

[beeankha]

Addresses this issue:

• Implement a Python interface #8

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To run this, enter the following command from the directory where the matchspec_in_rust.py is located:

$ maturin develop

[remkade]

Not sure how maturin likes to handle errors, but maybe this will work?

[remkade]

Maybe the correct way to do this is by returning a PyResult? That way we don't lose the possible error. Maybe this?

Suggested change

	fn match_against_matchspec(matchspec: String, package: String, version: String) -> bool {
	let ms: matchspec::MatchSpec<String> = matchspec.parse();
	ms.is_package_version_match(&package, &version)
	}
	fn match_against_matchspec(matchspec: String, package: String, version: String) -> PyResult<bool> {
	let ms: matchspec::MatchSpec<String> = matchspec.parse()?;
	Ok(ms.is_package_version_match(&package, &version))
	}

That question mark after the parse() will return the error if there is one, otherwise will unwrap the Ok(MatchSpec<String>) and give just the MatchSpec<String>.

[beeankha]

I tried using unwrap() as suggested by @marcoesters (suggestion was made outside of this PR) and it seems to work!