Watch Make Medium yours Follow all the topics you care about, and well deliver the best stories for you to your homepage and inbox.

For example, the following is the most common one that most people encounter.

IOError: Errno 13 Permission denied: LibraryPython2.7site-packagesvirtualenv.py Most probably installing any python library using pip might give similar kind of errors.

Opencv For Python 2.7 On Mac OS But

First, lets try to understand why this kind of errors occurs in Mac OS but not on Linux.

In Mac OS, there is a new security layer called System Integrity Protection.

This will protect changing system files even from the root user.

Therefore for the permission relates issues, though you use sudo with pip it might not work.

The other thing is python is already installed in Mac OS and above error shows the system installed python location.

Most of the time people try to install Open CV and python using brew and though they set path to use python installed by brew, the above error can occur.

This might occur due to previously installed packages with system python installation and brew try to attach to those.

Opencv For Python 2.7 On How To Do This

This is to install C compiler to mac and easiest way to install Xcode is via the app store and youll able to find an ample amount of tutorials on how to do this on the internet.

After that install Xcode command-line tools using the following command.

Install homebrew using any tutorial and add the following line to at the end of your.bashprofile or.bashrc file.

I prefer.bashrc since I use a custom terminal and bashprofile wont always run.

Unlike with normal brew python 2.7 installation, it wont automatically install with python3.

This is to create a virtual environment for each project therefor dependencies of multiple projects do not collide with each other.

This comes handy when two projects need the same python package but with two different versions.

This will install OpenCV globally and later when we create virtual environments and well refer this within our virtual environments since we do not need to install it in every environment we create.

Please note that python version number can different in your installation and change accordingly if required.

To create a virtual environment with the name of cv-py3 run first command.

The second command will switch to that env and the third one will exit from env.

This virtual environment is located in.virtualenvs.

Now you can install any python library within this environment see the following example.

If the third one runs without any errors, installation is a success.

And you can print the version of it using the fourth command.

On Medium, smart voices and original ideas take center stage - with no ads in sight.

Install Opencv For Python 2.7 On Mac