Some minor code adjustments plus a CLI

[nir0s]

No description provided.

[nir0s]

There's a problem with using argparse here. It's not supported by default in 2.6 (which we should still support due to the % of companies using it).

[asottile]

For argparse you can do conditional requirements (such as this example)

[andy-maier]

From looking at the code, it seems that test case TestCliassumes that the distrocommand outputs JSON format, but it does that only when invoked with the -j option.

[andy-maier]

What do people think about an lsb_release compatible cli for distro?

[nir0s]

In what sense?

[nir0s]

As suggested by @asottile , do we agree that argparse should be conditional and that if someone who uses 2.6 doesn't have argparse it becomes a dependency?

[MartijnBraam]

I think that's the better option, I personally find that argparse produces a way better command line tool than optparse.

The oldest python version I used is 2.7 and I don't have any experience with optional dependencies so I don't know the pitfalls but it seems like a good solution.

[asottile]

Another option would be to drop 2.6 support (which has been end of lifed for several years).

[nir0s]

Many companies still use 2.6. See the PR. I added argparse as a conditional requirement.
Also, added an entry point so that you can simply run distro instead of python -m distro.

[nir0s]

If we're going to release 1.0.0, I think we need this in..

[nir0s]

solves #133