Install pip packages with homebrew

gistfile1.txt

Install pip packages with homebrew:
1. Install Homebrew
  http://mxcl.github.com/homebrew/
2. Install the brew-pip package
  brew install brew-pip
3. Add Homebrew's pip path to your PYTHONPATH environment variable (you probably should add this to some sort of shell initialization file like ~/.bashrc or ~/.zshrc)
  export PYTHONPATH=$(brew --prefix)/lib/python2.7/site-packages
3. Now install any pip pacakges with Homebrew!
  brew pip Glances

I noticed a number of Python libraries were added and then deleted from Homebrew in the last month or so. is there something "going on"?

Use pipx.

pip3 install BetterADBSync
error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try brew install
    xyz, where xyz is the package you are trying to
    install.
    
    If you wish to install a non-brew-packaged Python package,
    create a virtual environment using python3 -m venv path/to/venv.
    Then use path/to/venv/bin/python and path/to/venv/bin/pip.
    
    If you wish to install a non-brew packaged Python application,
    it may be easiest to use pipx install xyz, which will manage a
    virtual environment for you. Make sure you have pipx installed.

note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.

Use pipx.

pip3 install BetterADBSync
error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try brew install
    xyz, where xyz is the package you are trying to
    install.
    
    If you wish to install a non-brew-packaged Python package,
    create a virtual environment using python3 -m venv path/to/venv.
    Then use path/to/venv/bin/python and path/to/venv/bin/pip.
    
    If you wish to install a non-brew packaged Python application,
    it may be easiest to use pipx install xyz, which will manage a
    virtual environment for you. Make sure you have pipx installed.

note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.

I have the same issue I tried in all other ways, but even still I'm not able to install the pip.
Any suggestions.....

You can use Python's venv like described here.

However if you really want to install packages that way, then there are a couple of solutions:

use pip's argument --break-system-packages,
add following lines to ~/.config/pip/pip.conf:

[global]
break-system-packages = true