Prerequisites for installing Python3 on Mac Install Xcode. Homebrew is a package manager for Mac OS. Launch Terminal. Usually your Python installation. Doing it Right¶. Let’s install a real version of Python. Before installing Python, you’ll need to install GCC. GCC can be obtained by downloading Xcode, the smaller Command Line Tools (must have an Apple account) or the even smaller OSX-GCC-Installer package. Before we start with how to install pip for Python on macOS, let’s first go through the basic introduction to Python. Python is a widely-used general-purpose, high-level programming language. Python is a programming language that lets you work quickly and integrate systems more efficiently.
Apple’s Mac OS comes with python 2.7 installed by default. Perhaps you may want to use python 3.x.x on your machine and also use pip for package management with
python 3.x.x. The easiest way to achieve this is by:
NOTE: This tutorial does not useVirtual Environments like
pyenv to manage various
- Follow this link and download the latest
- Run the package and follow the steps to install
python3on your computer.
- Once the installation is done, on your
This will print out the version of python installed on your system. The output should be similar to:
You may verify the installation directory of
python by runningthe following line on the
The prompt should print the install path for
python3. An example output is:
- Securely download the
get-pip.pyfile from this link
- From the directory where the file was downloaded to, run the following command in the
- Once the installation completes you should see the prompt print message similar to this
- Verify the installation of
pip3by running the following on the
This should return the install location of
- To install
Remember to replace
packageName with the appropriate package name for your case.
MacOS comes with Python pre-installed. But it's Python Version 2.7, which is now deprecated (abandoned by the Python developer community).
The entire Python community has now moved on to using Python 3.x (the current version as of writing this is 3.9). And Python 4.x will be out soon, but it will be completely backward compatible.
If you try to run Python from your MacOS terminal, you'll even see this warning:
Until Apple decides to set Python 3.x, as the default you're going to have to install it yourself.
A Single Command to Run Python 3
For some of you reading this, this command may be enough. You can run Python 3 using this command (with the 3 at the end).
If that's all you came for, no worries. Have a fun day and happy coding.
But if you want a proper Python version control system to keep track of various versions – and have fine-grain control over which version you use – this tutorial will show you exactly how to accomplish this.
How to Install Homebrew on Mac
First you need to install Homebrew, a powerful package manager for Mac.
Open up your terminal. You can do this by using MacOS spotlight (command+space) and typing 'terminal'.
Now that you're in a command line, you can install the latest version of Homebrew by running this command:
Install Python 3.5 Mac Terminal
Your terminal will ask for Super User-level access. You will need to type your password to run this command. This is the same password you type when you log into your Mac. Type it and hit enter.
Homebrew will ask you to confirm you want to install the following. You have to press enter to continue. (Or press any other key if you get cold feet.)
How to Install pyenv to Manage Your Python Versions
Now let's take a moment to install PyEnv. This library will help you switch between different versions of Python (in case you need to run Python 2.x for some reason, and in anticipation of Python 4.0 coming).
Run this command:
Now you can install the latest version of Python.
Install Python Terminal Mac Os
How to Use pyenv to Install Python or Update Your Python Version
Now you just need to run the following command:
Note that you can substitute 3.9.2 for whatever the latest version of Python is. For example, once Python 4.0.0 comes out, you can run this:
Troubleshooting pyenv Installation
If you encounter an error that 'C compiler cannot create executables' then the simplest way to solve this is to reinstall Apple's Xcode.
Xcode is a tool created by Apple that includes all the C libraries and other tools that Python uses when it runs on MacOS. Xcode is a whopping 11 gigabytes, but you'll want to be up-to-date. You may want to run this while you're sleeping.
You can get the latest version of Apple's Xcode here. I had to do this after upgrading to MacOS Big Sur, but once I did, all the following commands worked fine. Just re-run the above
pyenv install 3.9.2 and it should now work.
How to Set Up Your MacOS PATH for pyenv (Bash or ZSH)
First you need to update your Unix path to pave a way for PyEnv to be able to interact with your system.
This is a long explanation of how PATH works in MacOS (and Unix), straight from the pyenv GitHub repo.
When you run a command like
pip, your operating system searches through a list of directories to find an executable file with that name. This list of directories lives in an environment variable called
PATH, with each directory in the list separated by a colon:
PATHare searched from left to right, so a matching executable in a directory at the beginning of the list takes precedence over another one at the end. In this example, the
/usr/local/bindirectory will be searched first, then
And here is their explanation of what a Shim is. I'm quoting them at length again because I really can't explain this better myself.
pyenv works by inserting a directory of shims at the front of your
Through a process called rehashing, pyenv maintains shims in that directory to match every Python command across every installed version of Python—
pip, and so on.
Shims are lightweight executables that simply pass your command along to pyenv.
Here's how to update your
.bash_profile in Bash (which is installed in MacOS by default):
Or if you've installed ZSH (or OhMyZSH) like I have, you'll want to edit the
.zshrc file instead:
Then you want to add PyEnv Init to your terminal. Run this command if you're using Bash (again, this is the default with MacOS):
Or run this command if you're using ZSH:
Install Python Using Terminal Mac
Now reset your terminal by running this command:
How to Set a Version of Python to Global Default (Bash or ZSH)
You can set the latest version of Python to be global, meaning it will be the default version of Python MacOS uses when you run Python applications.
Run this command:
Again, you can replace 3.9.2 with whatever the latest version is.
Now you can verify that this worked by checking the global version of Python:
You should see this output:
The Final Step: Close Your Terminal and Restart it
Once you've restarted your browser, you run the
python command and you'll launch the new version of Python instead of the old one.
Install Python Packages Mac Terminal
Congratulations. Thank you for reading this, and happy coding.