Python - Math - Working with Numbers(Enhanced Unit Converter)

Doing Math with Python
(No Starch Press)
Amit Saha (著)

開発環境

• OS X El Capitan - Apple (OS)
• Emacs (Text Editor)
• Python 3.5 (プログラミング言語)

Doing Math with Python: Use Programming to Explore Algebra, Statistics, Calculus, and More! (Amit Saha (著)、No Starch Press)のChapter 1.(Working with Numbers)、Programming Challenges #3: Enhanced Unit Converter(No. 777)を解いてみる。

#3: Enhanced Unit Converter(No. 777)

コード(Emacs)

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

K = 0.453592                    # kg/p

def print_menu():
    print('1. Kilogram to Pound')
    print('2. Pound to Kilogram')
    print('3. Celsius to Fahrenheit')
    print('4. Fahrenheit to Celsius')
    
def kg2pound():
    kg = float(input('Enter kg: '))
    p = kg / K
    print('{0}p.'.format(p))

def pound2kg():
    p = float(input('Enter p: '))
    kg = p * K
    print('{0}kg.'.format(kg))
    
def celsius2fahrenheit():
    c = float(input('Enter celsius: '))
    f = c * 9 / 5 + 32
    print('{0} fahrenheit.'.format(f))

def fahrenheit2celsius():
    f = float(input('Enter fahrenheit: '))
    c = (f - 32) * 5 / 9
    print('{0} celsius.'.format(c))

if __name__ == '__main__':
    while True:
        print_menu()
        choice = input('which conversion would you like to do?: ')
        if choice == 'q':
            break
        elif choice == '1':
            kg2pound()
        elif choice == '2':
            pound2kg()
        elif choice == '3':
            celsius2fahrenheit()
        elif choice == '4':
            fahrenheit2celsius()
        else:
            print('Invalid choice: {0}'.format(choice))

入出力結果(Terminal, IPython)

$ ./sample3.py
1. Kilogram to Pound
2. Pound to Kilogram
3. Celsius to Fahrenheit
4. Fahrenheit to Celsius
which conversion would you like to do?: 1
Enter kg: 10
22.046244201837776p.
1. Kilogram to Pound
2. Pound to Kilogram
3. Celsius to Fahrenheit
4. Fahrenheit to Celsius
which conversion would you like to do?: 2
Enter p: 22.046244201837776
10.0kg.
1. Kilogram to Pound
2. Pound to Kilogram
3. Celsius to Fahrenheit
4. Fahrenheit to Celsius
which conversion would you like to do?: 3
Enter celsius: 20
68.0 fahrenheit.
1. Kilogram to Pound
2. Pound to Kilogram
3. Celsius to Fahrenheit
4. Fahrenheit to Celsius
which conversion would you like to do?: 4
Enter fahrenheit: 68
20.0 celsius.
1. Kilogram to Pound
2. Pound to Kilogram
3. Celsius to Fahrenheit
4. Fahrenheit to Celsius
which conversion would you like to do?: q
$