If you need to install the deprecated, legacy Python version 2. This makes it easy to test your code on both Python 3 and 2.
Homebrew recently changed the names of Python-related binaries to avoid potential confusion with those bundled with macOS. As a result, pip became pip2 , et cetera. Between this change and the many new improvements in Python 3, it seems a good time to start using pip3 for all the examples that will follow below. The following command will install Mercurial and hg-git :. Python packages installed via the steps above are global in the sense that they are available across all of your projects. That can be convenient at times, but it can also create problems.
For example, sometimes one project needs the latest version of Django, while another project needs an older Django version to retain compatibility with a critical third-party extension. This is one of many use cases that Virtualenv was designed to solve. What happens if we think we are working in an active virtual environment, but there actually is no virtual environment active, and we install something via pip3 install foobar? That accomplished the isolation objective, since Pip was only available from within virtual environments, making it impossible for me to pip3 install foobar into my global site-packages by mistake.
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Thankfully, Pip has an undocumented setting source that tells it to bail out if there is no active virtual environment, which is exactly what I want. But once that option is set, how do we install or upgrade a global package? The macOS Terminal is an application you can use to access the command line interface. Like any other application, you can find it by going into Finder, navigating to the Applications folder, and then into the Utilities folder.
From here, double-click the Terminal like any other application to open it up. Alternatively, you can use Spotlight by holding down the command and spacebar keys to find Terminal by typing it out in the box that appears. There are many more Terminal commands to learn that can enable you to do more powerful things.
Xcode is an integrated development environment IDE that is comprised of software development tools for macOS. You may have Xcode installed already. To check, in your Terminal window, type:. If you received an error, then in your web browser install Xcode from the App Store and accept the default options. Once Xcode is installed, return to your Terminal window.
At this point, Xcode and its Command Line Tools app are fully installed, and we are ready to install the package manager Homebrew. While the OS X Terminal has a lot of the functionality of Linux Terminals and other Unix systems, it does not ship with a good package manager. A package manager is a collection of software tools that work to automate installation processes that include initial software installation, upgrading and configuring of software, and removing software as needed. They keep installations in a central location and can maintain all software packages on the system in formats that are commonly used.
Homebrew provides OS X with a free and open source software package managing system that simplifies the installation of software on OS X. The curl command pulls a script from the specified URL.
This script will explain what it will do and then pauses the process to prompt you to confirm. This provides you with a lot of feedback on what the script is going to be doing to your system and gives you the opportunity to verify the process. To save your changes, hold down the control key and the letter o , and when prompted press the return key. Now you can exit nano by holding the control key and the letter x. Once you have done this, the changes you have made to the PATH environment variable will be effective. Otherwise, you may get a warning to run another command such as brew update to ensure that your installation of Homebrew is up to date.
The Terminal window will give you feedback regarding the installation process of Python 3, it may take a few minutes before installation is complete. Along with Python 3, Homebrew will install pip , setuptools and wheel.
QuickTip: How Do I Install pip on macOS or OS X?
A tool for use with Python, we will use pip to install and manage programming packages we may want to use in our development projects. You can install Python packages by typing:. So if you would like to install NumPy, you can do so with the command pip3 install numpy. This will output the specific version of Python that is currently installed, which will by default be the most up-to-date stable version of Python 3 that is available. Now that we have Xcode, Homebrew, and Python installed, we can go on to create our programming environment.
Setting up a programming environment provides us with greater control over our Python projects and over how different versions of packages are handled. This is especially important when working with third-party packages. You can set up as many Python programming environments as you would like. Each environment is basically a directory or folder in your computer that has a few scripts in it to make it act as an environment.
Choose which directory you would like to put your Python programming environments in, or create a new directory with mkdir , as in:. Once you are in the directory where you would like the environments to live, you can create an environment by running the following command:. This is good practice for version control and to ensure that each of your projects has access to the particular packages that it needs. To use this environment, you need to activate it, which you can do by typing the following command that calls the activate script:. Note: Within the virtual environment, you can use the command python instead of python3 , and pip instead of pip3 if you would prefer.
Exit nano by typing the control and x keys, and when prompted to save the file press y. The hello.
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At this point you have a Python 3 programming environment set up on your local Mac OS X machine and can begin a coding project! To set up Python 3 on another computer, follow the local programming environment guides for Ubuntu You can also read about installing Python and setting up a programming environment on an Ubuntu This tutorial series will guide you through installing Python 3 on your local machine and setting up a programming environment via the command line.
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