Python - Using Methods(module, docstring, doctest module, testmod method)

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 7(Using Methods)、7.6(Exercises) 12.を解いてみる。

7.6(Exercises) 12.

コード(BBEdit)

sample12.py

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

def total_occurences(s1, s2, ch):
    """ (str, str, str) -> int
    Precondition: len(ch) == 1
    Return the total number of times that ch occurs in s1 and s2
    >>> total_occurences('color', 'yellow', 'l')
    3
    >>> total_occurences('red', 'blue', 'l')
    1
    >>> total_occurences('green', 'purple', 'b')
    0
    """
    occurences = 0
    for x in s1 + s2:
        if x == ch:
            occurences += 1
    return occurences

if __name__ == '__main__':
    import doctest
    doctest.testmod()

入出力結果(Terminal, IPython)

$ ./sample12.py -v
Trying:
    total_occurences('color', 'yellow', 'l')
Expecting:
    3
ok
Trying:
    total_occurences('red', 'blue', 'l')
Expecting:
    1
ok
Trying:
    total_occurences('green', 'purple', 'b')
Expecting:
    0
ok
1 items had no tests:
    __main__
1 items passed all tests:
   3 tests in __main__.total_occurences
3 tests in 2 items.
3 passed and 0 failed.
Test passed.
$