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Python 3 Notes

[ HOME | LING 1330/2330 ]

Installing Python 3 on a Mac

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Steps

Head to python.org. Click 'Downloads', then download the latest version from there:

This downloads the 64-bit version of the latest Python release (3.8.5 as of August 2020).
- Alternatively, if you start from the release page such as https://www.python.org/downloads/release/python-385/, you should scroll all the way to the bottom and choose 'macOS 64-bit installer', for OS X 10.9 and later. See screenshot here.
- NOTE: If your Mac's OS version is older than 10.9 (year 2013), I recommend upgrading your OS first. If you are unable to, see this FAQ for how to install Python on an older version of Mac OS.
Proceed with installation. If everything goes fine, you should see an IDLE shortcut in your Launchpad.
Go ahead and try it out! Video tutorial here.

Should I Re-install?

If you already have a working version of Python on your laptop, you might be wondering if it is OK to keep it or you should re-install. The run-down:

Already have Python 3 but older version
If you previously installed an earlier version of Python 3 (say, 3.3.1 or something), then you should either update it or simply un-install it and then install the newest version of Python 3. That way, you can make sure you are working in the exactly same setup with the rest of the class, which just might save you some headache stemming from a configuration unique to your machine.
I have Anaconda Python
That works too! Make sure to update it to the latest 3.X version. There is one caveat: in LING 1330/2330, we will be using the interpretive shell interface via IDLE rather than Jupyter Notebook you probably have been using. This is how you launch IDLE for Anaconda Python:
1. Open up a Terminal.
2. Type in idle3 &, followed by ENTER. ('&' keeps Terminal usable while IDLE window is open.)

Python for Mac OS X

When you install Python 3 on a Mac, it does not update the python command to use Python 3 instead of Python 2. Instead, to run Python 3, you have to use the python3 command. Here’s how to fix this: First, check your Python version: Nats-MBP: natdunn$ python -V Python 2.7.15. We want that to say python 3. What shell are you using. Updating to Python 3.7.6 on Mac Terminal, issue with setting path. Ask Question Asked 10 months ago. Active 10 months ago. Viewed 46 times 0. I am new to bash and I was following this guide to update python to a specific version that I want (3.7.6). The easiest way is to download the Python installer from the python.org website. Visit Python.org and download the latest available Python installer file; Run the downloaded file and install Python 3.x on Mac. Python 3.6.x requires about 100MB of available disk space.

Python comes pre-installed on Mac OS X so it is easy to startusing. However, to take advantage of the latest versions ofPython, you will need to download and install newer versionsalongside the system ones. The easiest way to do that is toinstall one of the binary installers for OS X from thePython Download page. Installers areavailable for the latest Python 3 and Python 2 releases thatwill work on all Macs that run Mac OS X 10.5 and later.

Python releases include IDLE, Python's built-in interactivedevelopment environment. If you download and install Pythonfrom the release page, you may also need to download and installa newer version of Tcl/Tk for OS X. See theIDLE and Tkinter on OS X page formore information.

You can run a Python interpreter by double-clicking onApplications / Utilities / Terminal and typing python3 (if you'veinstalled a version of Python 3) or python (to use Python 2) inthe window that opens up. You can also launch IDLE for the Pythonversion you have installed by double-clicking its icon inthe appropriate Python version folder in the Applications folderor you can also just type idle3 or idle in a terminal window.

Install Python 3 Terminal

There are many thousands of additional Python software packagesavailable through PyPI, the PythonPackage Index. We recommend you use thepip tool to simplifyinstalling and managing additional packages. pip is includedwith Python 3.4 releases; for earlier releases, follow the pipinstall instructions.