how to install pip for python 2.7 code example

Example 1: installing pip

python -m pip install --upgrade pip

Example 2: python pip install

## To install Pip, first download get-pip.py from:
https://bootstrap.pypa.io/get-pip.py
  
## Then run the following command in the command line
## in the folder where the file has been saved.
python get-pip.py

Example 3: install pip3 for python 3.7

sudo apt install python3-pip

Example 4: pip upgrade python

pip freeze | %{$_.split('==')[0]} | %{pip install --upgrade $_}