[Python] How to install pip packages via --no-build-isolation when they are mentioned in...

Context : This is the problem https://github.com/pypa/pip/issues/6717#issue-468204416 I'm facing
and trying to solve via https://github.com/pypa/pip/issues/6717#issuecomment-511652167

I want to use

--no-build-isolation


In a py2.7 venv If I do:

pip install bottleneck==1.2.1 --no-build-isolation

Collecting bottleneck==1.2.1
Collecting numpy (from bottleneck==1.2.1)
Downloading https://files.pythonhosted.org/packages/d7/b1/3367ea1f372957f97a6752ec725b87886e12af1415216feec9067e31df70/numpy-1.16.5-cp27-cp27mu-manylinux1_x86_64.whl (17.0MB)
100% |████████████████████████████████| 17.0MB 1.2MB/s
Installing collected packages: numpy, bottleneck
Successfully installed bottleneck-1.2.1 numpy-1.16.5
You are using pip version 18.0, however version 19.2.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.



It installs fine

$ cat abc.txt
bottleneck==1.2.1, --no-build-isolation


but

$pip install -r abc.txt
Usage: pip [options]

Invalid requirement: bottleneck==1.2.1, --no-build-isolation
pip: error: no such option: --no-build-isolation

You are using pip version 18.0, however version 19.2.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.




and

$ pip install -r abc.txt
Usage: pip [options]

Invalid requirement: bottleneck==1.2.1 --no-build-isolation
pip: error: no such option: --no-build-isolation

You are using pip version 18.0, however version 19.2.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.



don't work.

How do I go about it.

I also tried bottleneck tries to install numpy release candidate but it doesn't help.

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