pip install ignores extras defined under pyproject.toml

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Issue

Hi, I’m trying to specify extras to my package,

My pyproject.toml contains optional dependencies:

[tool.poetry.dependencies]
mlflow = { version = "<2.0.0", optional = true }

And under extras I’ve defined it just like the documentation:

[tool.poetry.extras]
my_extra = ['mlflow']

The command poetry install -E my_extra works properly for local development.

But when I build the package, and try installing it with pip (from another project) running pip install mypkg[my_extra] I get the following message:

  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
  Ignoring mlflow: markers 'extra == "my_extra"' don't match your environment
...
...

I’m not sure why this is happening, previously with setup.py it never ignored my extras.

So I’ve tried playing around the pyproject.toml and I found a strange thing When I modified my_extra to specify the package versions:

[tool.poetry.extras]
my_extra = ['mlflow<2.0.0']

The installation with pip doesn’t ignore the extras anymore, BUT the poetry install -E my_extra command has stopped working…

Am I missing something? or is it a bug?

EDIT: The versions I’m using Poetry version: 1.1.4 pip version: 20.2.4

[orlevii]

Ok, I’ve figured it out -

if you name your extra with capital letters (in pyproject.toml), for some reason it ignores it with pip

The strange part is that apparently extras are case insensitive, so it doesn’t really matter pip install ./mypkg[EXT] is the same as pip install ./mypkg[ext] and yet, defining your extras like

[tool.poetry.extras]
EXT = ['...']

won’t work as intended.

I’m closing this issue, Thanks everyone for helping!

[sinoroc]

OK. You had me worried. Thanks for confirmation.