Installing Python 3 and IDLE

You'll need to install a Python for this class (because, you know, that's what we're programming in)!

🐍🐍🐍🐍

we'll be using Python 3.x
it comes with a text editor called Idle
instructions for installation can be found on the departmental syllabus: http://cs.nyu.edu/courses/fall15/CSCI-UA.0002-002/common_syllabus/#software

Alternatives to IDLE (Other Text Editors)

PyCharm

Download the Free Community Edition of PyCharm
Install PyCharm
- If you're on OSX, Yosemite, you may have to trick PyCharm into working with your system…
  - After moving PyCharm into your Applications folder…
  - Open the Applications folder (/Applications) in finder
  - Right-click on the PyCharm icon
  - Click on Show Contents
  - Right-click on info.plist
  - Choose "Open With"
  - Choose "Other…"
  - Choose "TextEdit"
  - Find JVMVersion
  - In the line underneath, <string>1.6*</string>
  - …change 1.6* to 1.8*
  - See the animated gif)
Configure PyCharm to use Python 3
- Go to PyCharm (in menu bar)
- Choose "Preferences"
- Click on "Default Project" on the left sidebar
- Click on "Interpreter"
- Choose Python 3 from the dropdown labeled "Project Interpeter" on the right
- See the animated gif)
Create a new program…
- Create a new project
- Click on project name on left side bar
- Go to File in the menu bar
- Choose "New…"
- Choose "File"

Using Sublime Text 2 with Python 3

Overview

Sublime text uses "build systems" to let you run files through external commandline applications. One use for this is to run your code through the Python interpreter!

Sublime Text 2 already comes with a Python build, but it uses your system's Python, which is most likely 2.x. If you've installed Python 3 side-by-side with your system Python, you can create a build specifically for Python 3.

Instructions

(note that these instructions are osx specific; you may not need the "path" line in the configuration for windows)

Download and install Sublime Text 2
Start Sublime Text 2
Go to Tools → Build System → New Build System…

sublime1

Add this code to untitled.sublime.build:

{
	"cmd": ["python3", "-u", "$file"],
	"file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
	"selector": "source.python",
	"path": "/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin"
}

Save this file as Python3.sublime.build (put it in /Users/yourusername/Library/Application Support/Sublime Text 2/Packages/User, which is the default directory that sublime drops you in)
Go to Tools → Build System
You should now see Python3 as a build option
Select Python3 as your build system:

sublime2

Usage

From here on, you can use ⌘ + b (or Tools → Build) to run your Python 3 programs

Verification

Create a new file and save it as test_python3_build.py
In this file, put in the following lines of code:

import sys
print(sys.version)

Run your program: ⌘ + b
It should print out something similar to:

3.2.3 (v3.2.3:3d0686d90f55, Apr 10 2012, 11:25:50) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]
[Finished in 0.1s]

Introduction to Computer Programming - CSCI-UA.0002 - Summer 2017

Installing Python 3 and IDLE

Alternatives to IDLE (Other Text Editors)

PyCharm

Using Sublime Text 2 with Python 3