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He helped 40 colleagues develop Python safely and consistently on macOS systems following one core principle.

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Please upgrade your Python as Python 2.7 wont be maintained after that date.

To my surprise, I found only a handful of StackOverflow posts, and they pointed me to partial solutions.

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Heres the full story of how to set up your environment without breaking anything built into the macOS operating system.

I will start by covering other ways that seem right but are not a good idea.

Skip to the end of this article if youre short on time and just want the recommended way.

Python runtimes are also comically challenging at times, as noted by XKCD.

I didnt want to download the latest release, move it into my path, and call it a day (or use brew install python3, which would do something similar).

I figured it would cause breakages down the line in a really frustrating way that I wouldnt know how to troubleshoot.

I thought the best path forward was to rip and replace whatever version of Python I was running to make a clear and definitive switch to the latest and greatest.

Further research proves this is exactly what we shouldnt do.

There are a couple options when we think about common installation patterns for applications on macOS.

If we use the package installation, a python3 fill will be available in usrlocalbin.

Whats nice about an alias is that its specific to our command-line shell.

Since I use zsh by default, I put the following into the.zshrc file.

It means we have to remember to check the website and download the new files since Python doesnt include a command-line way to update.

Since the Homebrew maintainers are more dependable at updating the release than most of us, we can use Homebrews version of Python 3 with the following command.

Although we changed our default Python command to be version 3, we have to alias our pip command separately if its on the previous version.

Since were using Homebrew as our package manager in this situation, we know it installed pip3 when we installed Python 3.

The default path should be the same as Python 3, but we can confirm this by asking the shell to find it.

I knew Moshe was familiar with Python, but I didnt know is that he is an author of many Python tutorials as well as an upcoming book on Python development on macOS.

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