I already had homebrew installed for perl.
I used the command
brew install python
and python 2.7 was installed. The bash profile command was altered to include the new python path at the start of the path command.
PATH="/Library/Frameworks/Python.framework/Versions/2.7/bin:${PATH}"
Install Python 3
Next, I tried to install python 3.brew search
The name of the package is python3.
brew install python3
This was the first error:
C compiler cannot create executables
I had read a comment earlier about installing Xcode. I already had Xcode. Another comment was to enable command line tools. I did not know if they were already enabled. They weren't.
xcode-select --install
After this command and install, I was able to get further, but the install failed. After error
Need 'brew link xz'
Typed the command
brew link xz
and received an error. So, I ran
brew doctor
I changed the permission on a file. I was able to continue. python 3 is now installed in /usr/local/bin/python3
Install Virtual Environment
I accessed Python Virtual Environment and learned about virtual environments.
Next, I created a virtual environment with the new python.
virtualenv -p python3 python3env
After installing, switch to the folder and activate the environment.
source bin/activate
Now, the path has the local python as the default python.
The virtual environment is alright, but I am limited to a text editor and console window.
Next, I installed Eclipse and added the PyDev plugin. I installed Eclipse for Java, since no option existed for python.
I followed the instructions at http://www.pydev.org/manual_101_install.html. I was required to accept a certificate that was not mentioned in the instructions.
For Mac, the preferences are not under the window menu, but in the usual preferences under Eclipse in the menu strip.
Next, I followed the instructions for creating a project. The interpreter was the default 2.7, not the new 3.5. I added the new interpreter to the preferences.
The tutorial is for 2. I am using 3, so tutorial code must be modified.
Next, I checked to see if NetBeans had a plugin for python. NetBeans 8.1 has a python package that can be installed easily, 8.02 requires some worked. I upgraded to 8.1.
The default python was for jython in NetBeans. I added a reference to my python 3.
The default template for creating a module used python 2 syntax. The template for creating a package used python 3 syntax.
Next, I created a virtual environment with the new python.
virtualenv -p python3 python3env
After installing, switch to the folder and activate the environment.
source bin/activate
Now, the path has the local python as the default python.
The virtual environment is alright, but I am limited to a text editor and console window.
Install Eclipse IDE
An IDE with code completion and syntax highlighting is preferable.Next, I installed Eclipse and added the PyDev plugin. I installed Eclipse for Java, since no option existed for python.
I followed the instructions at http://www.pydev.org/manual_101_install.html. I was required to accept a certificate that was not mentioned in the instructions.
For Mac, the preferences are not under the window menu, but in the usual preferences under Eclipse in the menu strip.
Next, I followed the instructions for creating a project. The interpreter was the default 2.7, not the new 3.5. I added the new interpreter to the preferences.
The tutorial is for 2. I am using 3, so tutorial code must be modified.
Install NetBeans IDE
Next, I checked to see if NetBeans had a plugin for python. NetBeans 8.1 has a python package that can be installed easily, 8.02 requires some worked. I upgraded to 8.1.
The default python was for jython in NetBeans. I added a reference to my python 3.
The default template for creating a module used python 2 syntax. The template for creating a package used python 3 syntax.
Update
https://opensource.com/article/19/5/python-3-default-mac
use pip to install modules
