Python - Creating Graphical User Interfaces(tkinter module, converter(Fahrenheit to Celsius))

Practical Programming
An Introduction to Computer Science
Using Python 3
(Pragmatic Programmers)
(Pragmatic Bookshelf)
Paul Gries (著) Jennifer Campbell (著)
Jason Montojo (著) Lynn Beighley (編集)

開発環境

• OS X Yosemite - Apple (OS)
• Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
• Python 3.4 (プログラミング言語)

Practical Programming: An Introduction to Computer Science Using Python 3 (Pragmatic Programmers) (Paul Gries (著)、Jennifer Campbell (著)、Jason Montojo (著)、Lynn Beighley (編集)、Pragmatic Bookshelf)のChapter 16(Creating Graphical User Interfaces)、16.7(Exercises) 5.を解いてみる。

16.7(Exercises) 5.

コード(BBEdit)

sample5.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
 
import tkinter

def fahrenheit2celsius(fahrenheit):
    return 5 / 9 * (fahrenheit - 32)
    return celsius * 9 / 5 + 32

window = tkinter.Tk()

frame = tkinter.Frame(window)
frame.pack()

label = tkinter.Label(frame, text='Temperature in Fahrenheit')
label.pack()

fahrenheit = tkinter.DoubleVar()
entry = tkinter.Entry(frame, textvariable=fahrenheit)
entry.pack()

celsius = tkinter.DoubleVar()
celsius_label = tkinter.Label(frame, textvariable=celsius)
celsius_label.pack()

convert = tkinter.Button(frame, text='Convert',
                         command=lambda:celsius.set(
                             fahrenheit2celsius(fahrenheit.get())))
convert.pack()

quit = tkinter.Button(frame, text='Quit', command=window.destroy)
quit.pack()

window.mainloop()

入出力結果(Terminal, IPython)

$ ./sample5.py
$