Mac OS X comes with Python 2.7 out of the box.

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You do not need to install or configure anything else to use Python 2. Theseinstructions document the installation of Python 3.

Typically, to approve apps you want to install, you have to go into System Preferences, but OS X Daily shows off a slightly quicker route through the Command Line. Using fsck to repair Mac OS X File System Question. My Macintosh computer doesn't boot into Mac OS X. Start up your computer in single-user mode to reach the command line. Note: If necessary, perform a forced restart as described in the Emergency Troubleshooting Handbook that came with your computer.

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 The version shipped with OS X may be out of date from theofficial current Python release,which is considered the stable production version.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

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.

will launch the Homebrew-installed Python 3 interpreter.

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¶

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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. 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.

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So, onward! To the Pipenv & Virtual Environments docs!

This page is a remixed version of another guide,which is available under the same license.

EDIT: This post have been getting very many views lately so ‘fess up in the comments if you want a part 2 with more advanced and new ways to use Mac OS X commands and wildcard characters.

This tip/post is going to be about several common Mac OS X commands and wildcard characters I have discovered, at work, that is useful to understand and know how to use. First off, wildcard characters are special characters such as * and ? that help you to find groups of filenames that have something in common.

For example, say I have a couple of files that I want to find in my home directory. My home directory is cluttered with junk files that I never take the time to organize. But somewhere within that junk pile of files there lay 8 files I would like. Their filenames are ssw_idl.a285, ssw_idl.r391, ssw_idl.z988, ssw_idl.c293, and the other 4 files are named similarly (“ssw_idl.” followed by a letter, then 3 numbers).

Open up terminal (or something similar like X11’s xterm) and type in ls then enter. This lists all your files and folders in the current directory.
Cramming time:
cd – changes directories (directories = folders). cd .. to go up a directory and cd FOLDERNAME to go to a folder in the current directory.
rm – deletes files/folders.
mkdir – makes directories (folders).
say 'Hello!' – computer says ‘Hello!’
more textFileName – opens up a text file for viewing inside the command line/shell.

Now the actual reason I wrote up this post was to show you how to display only certain files with similar names. So we’ll go on to learn about wildcard characters (to be completely honest, I am a noob to this whole wildcard thing; I am stilling learning also), and then about how to use wildcard characters in the Mac OS X command line. Skip ahead if you already know about wildcard characters.

——– The Good Stuff ——-

* – this star means “everything”.
ls * will display all folders and all files within those folders.
? – means any character. ?? means any two characters. So basically ls ??* will only display files/folders that have filenames 2 or more characters long.
alphabet and numbers – typing in any letters or numbers means that files/folders must have those exact letters/numbers.
ls *.jpg – lists all files that are jpeg images (.jpg extension)
The “.” (backslash then dot with no space, in case you couldn’t see it well) means a literal dot. No backslash before the dot would mean just any single character except for a new line (n).
ls a* – lists files/folders starting with an “a”.
ls *.* – lists only files because folders don’t have a dot in their name.
ls [a-z] – lists only folders with a one character letter for their name.
ls frame[0-9] – lists any files/folders starting with “frame” and then any 1 number.

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A very nicely made reference page for Mac OS X Commands:
http://www.ss64.com/osx/

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Any comments welcome! Show me something cool & new!