python - Could not find a version that satisfies the requirement flask (from versions: ) No matching distribution found for flask

Question

Exception occurs while installing package using pip. I tried installing numpy, flask and others. but getting below error.

C:UsersABC>pip install flask
Collecting flask
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x0667CB50>: Failed to establish a new connection: [Errno 11002] getaddrinfo failed')': /simple/flask/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x0667C190>: Failed to establish a new connection: [Errno 11002] getaddrinfo failed')': /simple/flask/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x0667C7F0>: Failed to establish a new connection: [Errno 11002] getaddrinfo failed')': /simple/flask/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x0667C8F0>: Failed to establish a new connection: [Errno 11002] getaddrinfo failed')': /simple/flask/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x0667C0F0>: Failed to establish a new connection: [Errno 11002] getaddrinfo failed')': /simple/flask/
  Could not find a version that satisfies the requirement flask (from versions: )
No matching distribution found for flask

Please help resolving it. Pip version is 18.1 Python version is 3.7

Answer 1

Okay, this is a hack that I always follow but works every time - I need to because my corp net is behind heavy layered security.

Every time you need to install pip pkgs, run the following commands beforehand from your cmd (you don't need to be Admin):

set http_proxy=http://your_corp_username:password@<your_corp_proxy_host>:<port>
set https_proxy=https://your_corp_username:password@<your_corp_proxy_host>:<port>

Then run your usual pip commands.

If pip throws some SSL trust/resolution error. You can also do the following to trust pip by your network:

pip --trusted-host=pypi.python.org --trusted-host=pypi.org --trusted-host=files.pythonhosted.org install <some_package>

Use the following for installing packages under current user only (this doesn't require Admin privileges)

pip --trusted-host=pypi.python.org --trusted-host=pypi.org --trusted-host=files.pythonhosted.org install <some_package>  --user