Python - Conditionals and Recursion(if/else, and)

Think Python

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)

Think Python (Allen B. Downey (著)、 O'Reilly Media)のChapter 5.(Conditionals and Recursion)のExercises 5-3(No. 1257)を取り組んでみる。

Exercises 5-3(No. 1257)

コード(Emacs)

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

def is_triangle(a, b, c):
    if a <= b + c and b <= c + a and c <= a + b:
        return 'Yes'
    return 'No'

if __name__ == '__main__':
    while True:
        try:
            print('input three stick lengths')
            a = float(input())
            if a <= 0:
                break
            b = float(input())
            c = float(input())
        except Exception as err:
            print(err)
        else:
            print(is_triangle(a, b, c))

入出力結果(Terminal, IPython)

$ ./sample3.py
input three stick lengths
1
1
1
Yes
input three stick lengths
1
1
2
Yes
input three stick lengths
1
1
3
No
input three stick lengths
1
3
1
No
input three stick lengths
3
1
1
No
input three stick lengths
1
2
3
Yes
input three stick lengths
1
2
4
No
input three stick lengths
2
4
1
No
input three stick lengths
4
1
2
No
input three stick lengths
1
4
2
No
input three stick lengths
4
2
1
No
input three stick lengths
2
1
4
No
input three stick lengths
0
$