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

问题

I have the below problem, I am using command

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

The problem I have is the proxy variable is not maintained through the installation process. It no longers has the proxy address when trying to install setuptools. I have tried using HTTP_PROXY and HTTPS_PROXY in my environment variables with no luck. Are there any other ways to set a proxy which will maintain through the pip install?

I have used -vvv to produce more error detail - pasted in at gist.github.com/blaggrob/19e7afcae2b4f1d36139fbf0a88a6651

Collecting pyinstaller
  Using cached https://files.pythonhosted.org/packages/03/32/0e0de593f129bf1d1e77eed562496d154ef4460fd5cecfd78612ef39a0cc/PyInstaller-3.4.tar.gz
  Installing build dependencies ... error
  Complete output from command c:\users\blaggr\appdata\local\programs\python\python37-32\scripts\python.exe -m pip install --ignore-installed --no-user --prefix C:\Users\blaggr\AppData\Local\Temp\pip-build-env-vd3w15r1 --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple --trusted-host pypi.python.org -- setuptools wheel:
  Collecting setuptools
    Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/setuptools/
    Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/setuptools/
    Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/setuptools/
    Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/setuptools/
    Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/setuptools/
    Could not find a version that satisfies the requirement setuptools (from versions: )
  No matching distribution found for setuptools

回答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.

来源：https://stackoverflow.com/questions/53280131/python-3-7-applying-the-proxy-to-all-parts-of-pip-installation-failing-to-main