Python - Designing Algorithms(finding the complement of a DNA sequence)

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 12(Designing Algorithms)、12.4(Exercises) 1-a, b, c.を解いてみる。

12.4(Exercises) 1-a, b, c.

コード(BBEdit)

sample1.py

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

# a. 省略
# b. 元の値は変更されない
# c.
def complement(dna):
    '''
    finding the complement of a DNA sequence
    >>> dna = 'AATTGCCGT'
    >>> complement(dna)
    'TTAACGGCA'
    >>> dna
    'AATTGCCGT'
    '''
    result = ''
    d = dict(A='T', T='A', G='C', C='G')
    for ch in dna:
        result += d[ch]
            
    return result

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

入出力結果(Terminal, IPython)

$ ./sample1.py -v
Trying:
    dna = 'AATTGCCGT'
Expecting nothing
ok
Trying:
    complement(dna)
Expecting:
    'TTAACGGCA'
ok
Trying:
    dna
Expecting:
    'AATTGCCGT'
ok
1 items had no tests:
    __main__
1 items passed all tests:
   3 tests in __main__.complement
3 tests in 2 items.
3 passed and 0 failed.
Test passed.
$