Python 3 on MacOS

Python 3 on MacOS

I recently had the need to create a small python script to run a process.  I quickly looked up a process I could utilize to read a Rest API then do some work based on that content.

I fired up Visual Studio code and wrote out the framework of the program I needed in about 10 min.  (NOTE: I have not used Python in a long time and it was fun to quickly put something together).

Once I was done writing the code I jumped into a term terminal and ran the program “python”.  It worked well – opened a file of records added to an array and displayed the line items and did a count.

I then added some code that referenced how to call an API and it used the “requests”, knowing I needed to run “pip install requests” before I ran the program, I was rewarded with an error.

 zsh: command not found: pip

After this error, I checked what python version was on my Mac (python –version) I then learned I was running python 2.7.

This was confusing as I had just run “brew install python” before starting the project.  Apparently, Mac comes with python 2.7 and when you install brew it does not update the path. I was able to run the app via command python3.  And install “requests” via pip3 requests.  But this was not the best solution for me.    I really just want to run python 3 all the time.

The solution I found was to alias Python to python3 in my profile.

I updated my .zshrc file with the following nano ~/.zshrc and added this to the last line “alias python=python”

After this, I had one more error.  I was using the print command incorrectly, python3 has the print function using () vs “”.

Here is what has changed:

print 'Hello, World!'
print('Hello, World!')

Lesson learned – Take a look at what version of the app you are using.  I spent more time figuring out how to update python on my Mac than I did writing my code.



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