Python - Making Choices(bool, if/else, Combining Comparisons)

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 5(Making Choices)、5.6(Exercises) 7.を解いてみる。

5.6(Exercises) 7.

コード(BBEdit)

sample7.py

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

for population, land_area in [(a, b) for a in
                              [9000000, 10000000, 35000000, 40000000] for b in
                              [80000, 90000, 340000, 300000]]:
    print('population = {0}, land_area = {1}'.format(population, land_area))
    print('1.')
    if population < 10000000:
        print(population)
    print('2.')
    if 10000000 <= population <= 35000000:
        print(population)
    print('3.')
    if population / land_area > 100:
        print('Densely populated')
    print('4.')
    if population / land_area > 100:
        print('Densely populated')
    else:
        print('Sparsely populated')

入出力結果(Terminal, IPython)

a$ ./sample7.py 
population = 9000000, land_area = 80000
1.
9000000
2.
3.
Densely populated
4.
Densely populated
population = 9000000, land_area = 90000
1.
9000000
2.
3.
4.
Sparsely populated
population = 9000000, land_area = 340000
1.
9000000
2.
3.
4.
Sparsely populated
population = 9000000, land_area = 300000
1.
9000000
2.
3.
4.
Sparsely populated
population = 10000000, land_area = 80000
1.
2.
10000000
3.
Densely populated
4.
Densely populated
population = 10000000, land_area = 90000
1.
2.
10000000
3.
Densely populated
4.
Densely populated
population = 10000000, land_area = 340000
1.
2.
10000000
3.
4.
Sparsely populated
population = 10000000, land_area = 300000
1.
2.
10000000
3.
4.
Sparsely populated
population = 35000000, land_area = 80000
1.
2.
35000000
3.
Densely populated
4.
Densely populated
population = 35000000, land_area = 90000
1.
2.
35000000
3.
Densely populated
4.
Densely populated
population = 35000000, land_area = 340000
1.
2.
35000000
3.
Densely populated
4.
Densely populated
population = 35000000, land_area = 300000
1.
2.
35000000
3.
Densely populated
4.
Densely populated
population = 40000000, land_area = 80000
1.
2.
3.
Densely populated
4.
Densely populated
population = 40000000, land_area = 90000
1.
2.
3.
Densely populated
4.
Densely populated
population = 40000000, land_area = 340000
1.
2.
3.
Densely populated
4.
Densely populated
population = 40000000, land_area = 300000
1.
2.
3.
Densely populated
4.
Densely populated
$