Python - Repeating Code Using Loops - range関数(start, stop, step), for loop, total, average

Practical Programming
楽天ブックス 紀伊国屋書店

開発環境

• macOS Catalina - Apple (OS)
• Emacs (Text Editor)
• Windows 10 Pro (OS)
• Visual Studio Code (Text Editor)
• Python 3.7 (プログラミング言語)

Practical Programming: An Introduction to Computer Science Using Python 3.6 (Paul Gries(著)、Jennifer Campbell(著)、Jason Montojo(著)、Pragmatic Bookshelf)のChapter 9(Repeating Code Using Loops)、Exercise 9、10、11の解答を求めてみる。

コード

#!/usr/bin/env python3
from unittest import TestCase, main
from test.support import captured_stdout

print('9, 10, 11.')


class MyTestCase(TestCase):

    def test9(self):
        with captured_stdout() as stdout:
            for n in range(33, 49 + 1):
                print(n)
        s = '''33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
'''
        self.assertEqual(stdout.getvalue(), s)

    def test10(self):
        with captured_stdout() as stdout:
            for n in range(10, 0, -1):
                print(n, end=' ')
        s = '10 9 8 7 6 5 4 3 2 1 '
        self.assertEqual(stdout.getvalue(), s)

    def test11(self):
        total = 0
        for n in range(2, 23):
            total += n
        average = total / (22 - 1)
        self.assertEqual(average, sum(range(2, 23)) / len(range(2, 23)))


if __name__ == '__main__':
    main()

入出力結果(Zsh、PowerShell、Terminal、Jupyter(IPython))

% ./sample9.py -v
9, 10, 11.
test10 (__main__.MyTestCase) ... ok
test11 (__main__.MyTestCase) ... ok
test9 (__main__.MyTestCase) ... ok

----------------------------------------------------------------------
Ran 3 tests in 0.000s

OK
%