May 17, 2017 In this Python Beginner Tutorial, we will start with the basics of how to install and setup Python for Mac and Windows. We will also take a look at.
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I installed python on mac os (mountain lion) with Macports.When I run $python It gives an error on 'cannot import urandom' when I try to import pandas or matplotlib.
If I run $python 2.7 Everything runs perfectly.
I want to change python to use python2.7 always.
I tried using sudo port select python python27. But that didn't help.
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Please help me on this, I'm new to mac.
2 Answers
First let me preface by saying that OSX already comes with python installed. Lion and Mountain Lion have python2.7 as the system defaults.
Now assuming you really did want to use a macports version, my guess is that you only installed it, but didn't do the step of modifying your PATH to have it look first for macport installed executables..
- Edit your
~/.profile - Add this line:
export PATH=/opt/local/bin:/opt/local/sbin:$PATH
The next time you open a shell, it will place the macports install location at the front of your path, giving you access to the executables.
jdijdiIf I remember correctly, you may want to do a 'sudo port activate python'. What does 'which python' tell you? If it's /usr/bin/python, you're running OSX Python. If, OTOH, it's /usr/local/bin/python you're probably using the ports version.
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Mac OS X comes with Python 2.7 out of the box.
You do not need to install or configure anything else to use Python 2. Theseinstructions document the installation of Python 3.
The version of Python that ships with OS X is great for learning, but it’s notgood for development. The version shipped with OS X may be out of date from theofficial current Python release,which is considered the stable production version.
Doing it Right¶
Let’s install a real version of Python.
Before installing Python, you’ll need to install GCC. GCC can be obtainedby downloading Xcode, the smallerCommand Line Tools (must have anApple account) or the even smaller OSX-GCC-Installerpackage.
Note
If you already have Xcode installed, do not install OSX-GCC-Installer.In combination, the software can cause issues that are difficult todiagnose.
Note
If you perform a fresh install of Xcode, you will also need to add thecommandline tools by running xcode-select--install on the terminal.
While OS X comes with a large number of Unix utilities, those familiar withLinux systems will notice one key component missing: a package manager.Homebrew fills this void.
To install Homebrew, open Terminal oryour favorite OS X terminal emulator and run
The script will explain what changes it will make and prompt you before theinstallation begins.Once you’ve installed Homebrew, insert the Homebrew directory at the topof your PATH environment variable. You can do this by adding the followingline at the bottom of your ~/.profile file
If you have OS X 10.12 (Sierra) or older use this line instead
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Now, we can install Python 3:
This will take a minute or two.
Pip¶
Homebrew installs pip pointing to the Homebrew’d Python 3 for you.
Working with Python 3¶
At this point, you have the system Python 2.7 available, potentially theHomebrew version of Python 2 installed, and the Homebrewversion of Python 3 as well.
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will launch the Homebrew-installed Python 3 interpreter.
Python
will launch the Homebrew-installed Python 2 interpreter (if any).
will launch the Homebrew-installed Python 3 interpreter.
If the Homebrew version of Python 2 is installed then pip2 will point to Python 2.If the Homebrew version of Python 3 is installed then pip will point to Python 3.
The rest of the guide will assume that python references Python 3.
Pipenv & Virtual Environments¶
Install Python 3 On Mac
The next step is to install Pipenv, so you can install dependencies and manage virtual environments.
A Virtual Environment is a tool to keep the dependencies required by different projectsin separate places, by creating virtual Python environments for them. Net nanny. It solves the“Project X depends on version 1.x but, Project Y needs 4.x” dilemma, and keepsyour global site-packages directory clean and manageable.
For example, you can work on a project which requires Django 1.10 while alsomaintaining a project which requires Django 1.8.
Best Python Setup For Mac
So, onward! To the Pipenv & Virtual Environments docs!
This page is a remixed version of another guide,which is available under the same license.