HTTPS - Cannot fetch index base URL https://pypi.python.org/simple/

Question

I am trying to install kazoo: I tried the following options: pip install kazoo and pip install "kazoo==2.6.1"

Upon running this command I am getting the following error:

Downloading/unpacking kazoo
  Cannot fetch index base URL https://pypi.python.org/simple/
  Could not find any downloads that satisfy the requirement kazoo
Cleaning up...
  No distributions at all found for kazoo
  Storing debug log for failure in /root/.pip/pip.log

Following is the content of /root/.pip/pip.log:

/usr/bin/pip run on Wed Jul 14 09:15:11 2021
Downloading/unpacking kazoo==2.6.1
Getting page https://pypi.python.org/simple/kazoo/
Could not fetch URL https://pypi.python.org/simple/kazoo/: 403 Client Error: [[[!!! 
BREAKING CHANGE !!!]]] Support for clients that do not support Server Name Indication is temporarily disabled and will be permanently deprecated soon. See https://status.python.org/incidents/hzmjhqsdjqgb and https://github.com/pypa/pypi-support/issues/978 [[[!!! END BREAKING CHANGE !!!]]]
Will skip URL https://pypi.python.org/simple/kazoo/ when looking for download links for kazoo==2.6.1
Getting page https://pypi.python.org/simple/
Could not fetch URL https://pypi.python.org/simple/: 403 Client Error: [[[!!! BREAKING CHANGE !!!]]] Support for clients that do not support Server Name Indication is temporarily disabled and will be permanently deprecated soon. See https://status.python.org/incidents/hzmjhqsdjqgb and https://github.com/pypa/pypi-support/issues/978 [[[!!! END BREAKING CHANGE !!!]]]
Will skip URL https://pypi.python.org/simple/ when looking for download links for kazoo==2.6.1
Cannot fetch index base URL https://pypi.python.org/simple/
URLs to search for versions for kazoo==2.6.1:
* https://pypi.python.org/simple/kazoo/2.6.1
* https://pypi.python.org/simple/kazoo/
Getting page https://pypi.python.org/simple/kazoo/2.6.1
Could not fetch URL https://pypi.python.org/simple/kazoo/2.6.1: 403 Client Error: [[[!!! BREAKING CHANGE !!!]]] Support for clients that do not support Server Name Indication is temporarily disabled and will be permanently deprecated soon. See https://status.python.org/incidents/hzmjhqsdjqgb and https://github.com/pypa/pypi-support/issues/978 [[[!!! END BREAKING CHANGE !!!]]]
Will skip URL https://pypi.python.org/simple/kazoo/2.6.1 when looking for download links for kazoo==2.6.1
Getting page https://pypi.python.org/simple/kazoo/
Could not fetch URL https://pypi.python.org/simple/kazoo/: 403 Client Error: [[[!!! BREAKING CHANGE !!!]]] Support for clients that do not support Server Name Indication is temporarily disabled and will be permanently deprecated soon. See https://status.python.org/incidents/hzmjhqsdjqgb and https://github.com/pypa/pypi-support/issues/978 [[[!!! END BREAKING CHANGE !!!]]]
Will skip URL https://pypi.python.org/simple/kazoo/ when looking for download links for kazoo==2.6.1
Could not find any downloads that satisfy the requirement kazoo==2.6.1
Cleaning up...
Removing temporary dir /tmp/pip_build_root...
No distributions at all found for kazoo==2.6.1
Exception information:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
status = self.run(options, args)
"~/.pip/pip.log" 34L, 3388C

I read a few articles about it which talks about SSL but here I am already using HTTPS

I also tried pip install --index-url=https://pypi.python.org/simple kazoo but nothing worked.

pip --version : pip 1.5.4 from /usr/lib/python2.7/dist-packages (python 2.7)

python --version : Python 2.7.6

I am running this in my local system on macOS Catalina 10.15.7 in a Docker container

I tried upgrading pip: pip install pip --upgrade it also gives the same error:

 Cannot fetch index base URL https://pypi.python.org/simple/
 Could not find any downloads that satisfy the requirement pip in /usr/lib/python2.7/dist-packages
 Downloading/unpacking pip
 Cleaning up...
 No distributions at all found for pip in /usr/lib/python2.7/dist-packages
 Storing debug log for failure in /root/.pip/pip.log

I am new to python. Any help is appreciated.