Optional dependencies?

[andreymal]

I'm not planning on using msgpack/toml/yaml in some small project, but they are always installed because pyserde requires them. As far as I understand the code, their use is isolated in separate submodules, so these dependencies can be safely uninstalled while related submodules are not used. So I suggest making these dependencies optional.

It might look something like this:

requires = [...]
msgpack_requires = ['msgpack']
toml_requires = ['toml']
yaml_requires = ['pyyaml']
# ...
setup(
    # ...
    extras_require={
        'msgpack': msgpack_requires,
        'toml': toml_requires,
        'yaml': yaml_requires,
        'full': msgpack_requires + toml_requires + yaml_requires,
        'test': tests_require,
    },
    # ...
)

Then all dependencies can be installed with something like pip install pyserde[full]

[yukinarit]

Hi @andreymal ! Thank you for being interested in pyserde!

I totally agree with you and your code LGTM. Could you make a PR for this if you don't mind? 😃