Move msgpack and pyyaml to extras about mashumaro

[Fatal1ty]

Hi @rominf @anthrotype

msgpack and pyyaml are going to be extra requirements in the next 3.0 version.

The existing mixins will be imported from mashumaro.mixins.msgpack and mashumaro.mixins.yaml.

[Fatal1ty]

@rominf I don't agree with you. If i make dependencies optional, it will break compatibility for those who already use mashumaro. If you really don't want to install dependencies for some reason, you can tell pip to ignore them with --no-dependencies flag.

[rominf]

Can you explain why do you think "it will break compatibility for those who already use mashumaro"? Users who already have mashumaro installed will not notice the change, as they will not even call pip for installation. On the other hand, if they would want to update all dependencies (but probably they won't if they use only conversion to and from dict only, as I), they will have do:

$ pip install -U mashumaro[msgpack,yaml]

That can be documented.

Also, how can I tell poetry not to install the dependencies? I don't think it's possible.

[Fatal1ty]

Users who already have mashumaro installed will not notice the change, as they will not even call pip for installation.

You're totally wrong here. The users should be able to install the current major version of mashumaro without making changes to their requirements. If setuptools had the ability to specify default "extras" dependencies, I would use it. There is the issue for that.

I will consider to make pyyaml and msgpack dependencies optional in the next major release.

[rominf]

You're totally wrong here. The users should be able to install the current major version of mashumaro without making changes to their requirements.

I don't agree with you, in my opinion it's a minor issue for users. But anyway, you are the creator of the library and I respect your opinion.

I will consider to make pyyaml and msgpack dependencies optional in the next major release.

Nice to hear. I hope you will do it, as it will attract more users.

[anthrotype]

my 2c: I really like mashumaro, I was thinking of replacing my use of cattrs with it, but decided not to because it forces my application to depend on msgpack and yaml which I am not planning on using. Please make them extras! Thanks

[Fatal1ty]

And finally these two packages are optional in 3.0.