Python 3.7: Applying the proxy to all parts of pip installation, failing to maintain the proxy variable

Question

I have the below problem, I am using command

pip install pyinstaller --proxy=http://webdefence.global.blackspider.com:80 --trusted-host=pypi.python.org
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Answer 1

You may have run into a bug with the new PEP 518 support implementation, where the isolated build environment created to install build-time dependencies is lacking the necessary proxy configuration.

You can bypass the new feature by using --no-build-isolation on the command line, by setting no-build-isolation=no in your configuration file or by setting the PIP_NO_BUILD_ISOLATION=no environment variable (yes, these last two options are counter-intuitive).

This does require that setuptools and wheels then are already installed before you can install pyinstaller.

I've filed a new issue with the pip project to track this, I don't believe it has been reported before.