Ability to specify more than one dependency in scoped "deps" config section

[robblovell]

In a project, to run the mypy static analyzer, I need to install both mypy and types-requests. While I could specify a separate requirements.txt for this, I would rather just put it as a list in the deps section:

[tox]
envlist   =
    tests
    dev
    lint
    compile
skipsdist = true
allowlist_externals =
    tox-echo.sh

[testenv]
deps =
    dev: -r media_analysis/requirements-m1.txt
    tests: -r media_analysis/requirements-m1.txt
    lint: pyflakes
    compile: mypy, types-requests

commands =
    dev: ./tox-echo.sh
    tests: python -m pytest media_analysis/
    lint: pyflakes media_analysis/
    compile: dmypy run --timeout 5 -- media_analysis

tox -e compile yields an error with installing of the dependencies mypy and types-requests:

ERROR: invocation failed (exit code 1), logfile: .../.tox/compile/log/compile-1.log
=================================================================================================== log start ====================================================================================================
ERROR: Invalid requirement: 'mypy, types-requests'

==================================================================================================== log end =====================================================================================================
ERROR: could not install deps [mypy, types-requests]; 
v = InvocationError(".../.tox/compile/bin/python -m pip install 'mypy, types-requests'", 1)
____________________________________________________________________________________________________ summary _____________________________________________________________________________________________________
ERROR: compile: could not install deps [mypy, types-requests]; 
v = InvocationError(".../.tox/compile/bin/python -m pip install 'mypy, types-requests'", 1)

It appears the arguments are not split at the comma and passed as a full string to pip.

python -m pip install 'mypy, types-requests'

instead of

python -m pip install 'mypy' 'types-requests'

Note that specifying compile: mypy, types-requests with a space (compile: mypy types-requests) instead makes no difference. compile: mypy types-requests would also be more consistent with the way pip works and might be the right implementation if this feature is included.

My workaround is to use a separate requirements.txt or to specify the extra dependency before the scoped ones:

...
[testenv]
deps =
    types-requests
    dev: -r media_analysis/requirements-m1.txt
    tests: -r media_analysis/requirements-m1.txt
    lint: pyflakes
    compile: mypy
...

or

...
[testenv]
deps =
    dev: -r media_analysis/requirements-m1.txt
    tests: -r media_analysis/requirements-m1.txt
    lint: pyflakes
    compile: -r media_analysis/requirements-compile.txt
...

I think the dependencies should be parsed and split at the comma so that multiple dependencies can be specified.

[jugmac00]

The usual way to define these kind of environments would be...

[testenv]
deps =
    dev: -r media_analysis/requirements-m1.txt
    tests: -r media_analysis/requirements-m1.txt
    lint: pyflakes
    compile: mypy, types-requests

commands =
    dev: ./tox-echo.sh
    tests: python -m pytest media_analysis/
    lint: pyflakes media_analysis/
    compile: dmypy run --timeout 5 -- media_analysis

[testenv:dev]
deps = -r media_analysis/requirements-m1.txt
commands = ./tox-echo.sh

[testenv:tests]
deps = -r media_analysis/requirements-m1.txt
commands = python -m pytest media_analysis/

...

Any reason why you do not follow this common pattern?