Python - Working with Text(length of a string(built-in function(len)))

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 Mavericks - 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 4(Working with Text)、4.7(Exercises) 9.を解いてみる。

4.7(Exercises) 9.

コード(BBEdit)

sample9.py

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

def total_length(s1, s2):
    """ (str, str) -> int
    return the sum of the lengths of s1 and s2
    >>> total_length('yes', 'no')
    5
    >>> total_length('yes', '')
    3
    >>> total_length('YES!!!!', 'Noooooo')
    14
    """
    return len(s1 + s2)

if __name__ == '__main__':
    for s1, s2 in [('yes', 'no'), ('yes', ''), ('YES!!!!', 'Noooooo')]:
        print(total_length(s1, s2))

入出力結果(Terminal, IPython)

$ ./sample9.py 
5
3
14
$