Consider using trove/mixed as default license information source

[johnthagen]

I've learned that trove classifiers are the preferred way to express license type information. See this note for explanation:

• add license to PKG_INFO metadata jaraco/skeleton#9 (comment)

I believe that the current default for pip-licenses --from is not ideal (basically it always needs to be changed to get the best license information.

Would you consider changing the default to either trove or mixed? I personally feel mixed is the best default because it will provide the most comprehensive license information and prefer the correct source of truth (the troves).

I find this particularly compelling:

The license field is a text indicating the license covering the package where the license is not a selection from the “License” Trove classifiers. See the Classifier field. Notice that there’s a licence distribution option which is deprecated but still acts as an alias for license.

[raimon49]

Yes, your opinion is correct.

pip-licenses started by outputting the license field, then supported the output of trove classifiers, and finally implemented mixed mode.

Currently, I think mixed mode can output the most desirable result.

However, changing the default behavior is a breaking change. I when to release a pip-licenses version 3.0, will probably adopt a mixed mode in default.

[johnthagen]

However, changing the default behavior is a breaking change. I when to release a pip-licenses version 3.0, will probably adopt a mixed mode in default.

Agree, and that plan sounds great! Thanks!