Editing 2to3 (section)

= Imports =

Place (the relevant subset of) this block at the beginning of each of your script files:

<syntaxhighlight lang="python" style="font-size: 70%">
from __future__ import division
from __future__ import print_function
from __future__ import absolute_import

import sys
if sys.version_info[0] < 3:
    import urllib2
    from urllib2 import URLError, HTTPError
    from urllib import quote
    from idlelib.TreeWidget import TreeItem, TreeNode
    from Tkinter import *
    import Tkinter
    import tkSimpleDialog
    import tkFileDialog
    import tkMessageBox
    import tkColorChooser
    import Queue
    import ttk
    from StringIO import StringIO
else:
    import urllib.request as urllib2
    from urllib.error import URLError, HTTPError
    from urllib.parse import quote
    from idlelib.tree import TreeItem, TreeNode
    from tkinter import *
    import tkinter as Tkinter
    from tkinter import simpledialog as tkSimpleDialog
    from tkinter import filedialog as tkFileDialog
    import tkinter.messagebox as tkMessageBox
    import tkinter.colorchooser as tkColorChooser
    import queue as Queue
    import tkinter.ttk as ttk
    from io import StringIO
</syntaxhighlight>

'''Some important notes:'''

* <code>from __future__ import division</code> will change the behavior of integer division, <code>3/2 == 1</code> becomes <code>3/2 == 1.5</code>. Use <code>//</code> if you need [https://python-reference.readthedocs.io/en/latest/docs/operators/floor_division.html floor division] (<code>3//2 == 1</code> in both Python 2 and 3).
* <code>io.StringIO</code> is not an exact replacement for <code>StringIO.StringIO</code>, it doesn't accept [https://docs.python.org/3/library/stdtypes.html#bytes bytes] input. You might need <code>io.BytesIO</code> instead.