There are a few options to install pip on MacOS:
Option 1: Use Homebrew (recommended)
Homebrew is one of the better package managers for Mac. To install Homebrew, open Terminal and type:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Read more here.
Install pip using Homebrew
Using Homebrew to install python will install the latest Python (Python 3.7 currently), pip, and Setuptools.
brew install python
Option 2: Use easy_install
easy_install is the predecessor to pip, and it comes preinstalled on macOS (along with Python 2). You can use easy_install to install pip for Python 2.
sudo easy_install pip
Download the installer script
Right click on this installer script and select Save As....
Run the installer script
Open the Command Prompt, then navigate to the directory where you downloaded the script.
The command to install pip on Linux will vary based on the distribution you're using (and the package manager). Below I'll list the common package managers.
APT (Advanced Packaging Tool)
sudo apt-get install python-pip
sudo apt-get install python3-pip
sudo pacman -S python2-pip
sudo pacman -S python-pip
sudo yum upgrade python-setuptools sudo yum install python-pip python-wheel
sudo yum install python3 python3-wheel
Now that pip is installed, learn how to install Python packages using pip.