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Instructions to install igraph on python2, in your terminal execute these lines: brew install cairo brew install py2cairo brew install igraph. Now this last line above line installs the C-core. Final terminal line is: sudo pip install python-igraph. The above line installs igraph for python2, note these lines take about 2 minutes to complete. The Python SpeedSheet: It is an interactive cheat sheet that brings the answer to you. It is a really simple idea but it worked so well that it has become an indispensable tool for me any time I'm coding. Type in what you are looking for in the search bar and the speed sheet will display the answer. On most versions of MacOS before Catalina, a distribution of Python is already included. Unfortunately, it’s almost certainly an old version, Python 2.7. Luckily, there are two ways to install Python 3 on a Mac with ease. 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.
May 29th, 2020
- Link toInstalling the latest version of Python on Mac OS Catalina and overriding the old default pre-installed versionpodcast on anchorfm
I finally did it. I successfully installed Python version 3.7.7 viaHomebrew on my Maclaptop with OS Catalinainstalled.
For those of you that still might be trying to figure outhow todo this, I will walk you through.
The reason why I was eager to make sure that I had the latest versioninstalled was because I am working on publishing (open-source)teaching-relateddocumentation on Read The Docs, and I need to havePythoninstalled in order to be able to install the programsnecessary to publishthere.
The default2.7.17 version of Python was retired this pastJanuary 2020. I had tried back then to replace it with Python 3+,but was unsuccessful at the time. The following is what I did today:
First I updated Homebrew. Yes, I used Homebrew to (re)installPython. It’s really easy. It’s just a matter of putting the pieces of thepuzzle together correctly!
I ran the command
To updateHomebrew. Then I ran the command
Install Python On Mac Catalina Download
To (re)install Python. Then I ran
To see which version of Python my Mac laptop was recognizing. Itstill recognized only Python 2.7.17. So I ran the followingcommand:
It told me the path to my newly installedPython 3.7.7. I had tochange the path to Python in order for my Mac to recognize thenewly installed version. This is what the command brew info python returned tome in Terminal:
So I had to add the following at the bottom of my .zshrc fileto update the path to my newly installed version of Python viaHomebrew:
Then I made sure to quitTerminal and go back in so that the pathwould actually be updated in a newTerminal windowinstance.
Then I checked what version of Python was recognized now with
And this is what was returned:
Success! It’s as easy as that.
And BTW, if you don’t know how to access your .zshrc file in Catalina,you simply execute the following command:
And your file will open in a new window. Then you can paste
At the bottom of the file.
I will be embedding this episode of Plugging in The Holes along with atranscript in the form of a post oninterglobalmedianetwork.com for yourhearing and reading pleasure. Bye for now!
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Created by Maria D. Campbell who lives and works in New York City building useful things.You should follow her on Twitter. She also has a developer blogmariadcampbell.comyou may want to check out!
Posted on October 21, 2019 by Paul
Updated 11 February 2020
In this article, I will show you how to install OpenCV 4 with Python 3 on macOS Catalina.
There is also a video version of this tutorial:
MacOS comes by default with Python 2.7 which, at this point, receives only bug fixes and will be EOL by 2020. Python 3.x is the future and it is supported by all major Python libraries. In this tutorial, we’ll use the Python 3.8.
Start by installing the Command Line Tools for macOS. Please note, that you will need the Command Line Tools even if you’ve already installed Xcode. Open a Terminal and write:
How To Install Python 3 On Mac Catalina
Once the Command Line Tools are installed, we can install Python.
The official installer of Python is a pkg file that will start a GUI installer which will guide you through the installation. You can also check the video version of this tutorial if you want to see how I did it.
As a side note, you can have multiple Python 3 versions installed on your macOS machine. If this is the case, you can select which version you want to use by specifying the version number, e.g.:
Install Python On Mac Catalina Os
or:
After the above, you can invoke Python 3.8 using the python3.8 command. python3 will also invoke the latest installer version of Python 3. This is what I see if I run python3.8 on my machine:
Next, let’s follow best practices and create a new Python environment in which we can install NumPy and OpenCV:
At this point, your prompt should indicate that you are using the work environment. You can read more about Python environments in the documentation.
Once an environment is activated, all the install commands will apply only to the current environment. By default, if you close your Terminal, the environment is deactivated. If you want to be able to use it, use the source work/bin/activate command.
We can install NumPy and OpenCV with:
Please note that the above will install the slightly older OpenCV 4.1, latest binary version doesn’t seem to work on macOS Catalina!
As a side note, when you are in a new environment you can use python to invoke the Python interpreter, no need to use the version number.
At this point, you should have OpenCV 4 and Python installed on your Mac. We can write a small test program that will print the OpenCV version, load an image from the disk, convert the image to gray and show the result. Start by downloading the next image:
Save it as clouds.jpg. In the same folder where you’ve saved the above image, create a new file demo.py and write the next code:
Run the code with:
(You can close the two windows by pressing ESC!)
You should see something like in the next figure. By default, the last image (the gray one) will be over the first one. You need to move the window in order to see both images:
If you want to learn more about OpenCV and Python I would recommend reading OpenCV with Python Blueprints by M. Beyeler:
Install Python On Mac Catalina
or, OpenCV with Python By Example by G. Garrido and P. Joshi: