How to Install Python Packages [Ssl: Tlsv1_Alert_Protocol_Version]

Not able to install Python packages [SSL: TLSV1_ALERT_PROTOCOL_VERSION]

Upgrade pip as follows:

curl https://bootstrap.pypa.io/get-pip.py | python

Note: You may need to use sudo python above if not in a virtual environment.

(Note that upgrading pip using pip i.e pip install --upgrade pip will also not upgrade it correctly. It's just a chicken-and-egg issue. pip won't work unless using TLS >= 1.2.)

As mentioned in this detailed answer, this is due to the recent TLS deprecation for pip. Python.org sites have stopped support for TLS versions 1.0 and 1.1.

From the Python status page:

Completed - The rolling brownouts are finished, and TLSv1.0 and
TLSv1.1 have been disabled. Apr 11, 15:37 UTC

For PyCharm (virtualenv) users:

Run virtual environment with shell. (replace "./venv/bin/activate" to your own path)
```
source ./venv/bin/activate
```

Run upgrade

curl https://bootstrap.pypa.io/get-pip.py | python

Restart your PyCharm instance, and check your Python interpreter in Preference.

python - Can't install packages (in venv via Powershell)

This seems like it is an issue with Powershell downloading the package.

Try:

downloading get-pip.py via your web browser
navigating in Powershell to the directory you downloaded get-pip.py to
running;
```
 python get-pip.py
```

This should install pip. If you can't download packages via pip once installed it is likely there is either a connection issue between you and pypi.org or between powershell and your outgoing connection.

Pip SSL Error on Windows

What ended up working for me is to add all the domains that are part of the new pypi routing.

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

Which can also be setup in a pip.ini file.

pip install fail with SSL certificate verify failed (_ssl.c:833)

I have experienced similar issues when I am in a corporate network where a proxy is required for external network access. In this case, we'll have to tell pip the proxy:

pip --proxy=http://your.corporate.proxy.com  install pytesseract

Another possible cause is due to the pypi domain change. In this case, you can try the solution as below:

pip --index-url=http://pypi.python.org/simple/ --trusted-host pypi.python.org install pytesseract

Another similar case with an excellent answer: pip always fails ssl verification