Python - Object-Oriented Programming - Continent, Compositions, Country, population, area, class, methods(__init__, __str__)

開発環境

macOS Catalina - Apple (OS)
Emacs (Text Editor)
Windows 10 Pro (OS)
Visual Studio Code (Text Editor)
Python 3.8 (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 14(Object-Oriented Programming)、Exercise 2の解答を求めてみる。

コード

continent_test.py

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


class TestContinent(TestCase):
    def setUp(self):
        canada = Country('Canada', 34482779, 9984670)
        usa = Country('United States of America', 313914040, 9826675)
        mexico = Country('Mexico', 112336538, 1943950)
        self.north_america = Continent('North America', [canada, usa, mexico])

    def test_name(self):
        self.assertEqual(self.north_america.name, 'North America')

    def test_countries(self):
        with captured_stdout() as stdout:
            for country in self.north_america.countries:
                print(country)
        s = '''Canada has a population of 34482779 and is 9984670 square km.
United States of America has a population of 313914040 and is 9826675 square km.
Mexico has a population of 112336538 and is 1943950 square km.
'''
        self.assertEqual(stdout.getvalue(), s)

    def test_total_population(self):
        self.assertEqual(self.north_america.total_population(), 460733357)

    def test_str(self):
        s = '''North America
Canada has a population of 34482779 and is 9984670 square km.
United States of America has a population of 313914040 and is 9826675 square km.
Mexico has a population of 112336538 and is 1943950 square km.'''
        self.assertEqual(str(self.north_america), s)


if __name__ == "__main__":
    main()

continent.py

from country import Country
from typing import List


class Continent:
    def __init__(self, name: str, countries: List[Country]):
        self.name = name
        self.countries = countries

    def total_population(self) -> int:
        return sum([country.population for country in self.countries])

    def __str__(self) -> str:
        return self.name + '\n' + \
            '\n'.join([str(country) for country in self.countries])

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

% ./continent_test.py 
E
======================================================================
ERROR: test_name (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 16, in test_name
    self.assertEqual(self.north_america.name, 'North America')
AttributeError: 'Continent' object has no attribute 'name'

----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (errors=1)
% ./continent_test.py
.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK
% ./continent_test.py 
.E
======================================================================
ERROR: test_str (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 19, in test_str
    with captured_stdout as stdout:
AttributeError: __enter__

----------------------------------------------------------------------
Ran 2 tests in 0.000s

FAILED (errors=1)
% ./continent_test.py
.E
======================================================================
ERROR: test_str (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 20, in test_str
    for country in self.north_america.countries:
AttributeError: 'Continent' object has no attribute 'countries'

----------------------------------------------------------------------
Ran 2 tests in 0.000s

FAILED (errors=1)
% ./continent_test.py
..
----------------------------------------------------------------------
Ran 2 tests in 0.000s

OK
% ./continent_test.py 
..E
======================================================================
ERROR: test_total_population (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 29, in test_total_population
    self.assertEqual(self.north_america.total_population(), 468733357)
AttributeError: 'Continent' object has no attribute 'total_population'

----------------------------------------------------------------------
Ran 3 tests in 0.001s

FAILED (errors=1)
% ./continent_test.py
..F
======================================================================
FAIL: test_total_population (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 29, in test_total_population
    self.assertEqual(self.north_america.total_population(), 468733357)
AssertionError: 460733357 != 468733357

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

FAILED (failures=1)
% ./continent_test.py
...
----------------------------------------------------------------------
Ran 3 tests in 0.000s

OK
% ./continent_test.py
..F.
======================================================================
FAIL: test_str (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 37, in test_str
    self.assertEqual(self, s)
AssertionError: <__main__.TestContinent testMethod=test_str> != 'North America\nCanada has a population o[180 chars]m.\n'

----------------------------------------------------------------------
Ran 4 tests in 0.001s

FAILED (failures=1)
% ./continent_test.py
..F.
======================================================================
FAIL: test_str (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 37, in test_str
    self.assertEqual(self, s)
AssertionError: <__main__.TestContinent testMethod=test_str> != 'North America\nCanada has a population o[180 chars]m.\n'

----------------------------------------------------------------------
Ran 4 tests in 0.001s

FAILED (failures=1)
% ./continent_test.py
..F.
======================================================================
FAIL: test_str (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 37, in test_str
    self.assertEqual(self, s)
AssertionError: <__main__.TestContinent testMethod=test_str> != 'North America\nCanada has a population o[180 chars]m.\n'

----------------------------------------------------------------------
Ran 4 tests in 0.001s

FAILED (failures=1)
% ./continent_test.py
..F.
======================================================================
FAIL: test_str (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 37, in test_str
    self.assertEqual(str(self), s)
AssertionError: 'test_str (__main__.TestContinent)' != 'North America\nCanada has a population of[179 chars]m.\n'
- test_str (__main__.TestContinent)
+ North America
Canada has a population of 34482779 and is 9984670 square km.
United States of America has a population of 313914040 and is 9826675 square km.
Mexico has a population of 112336538 and is 1943950 square km.



----------------------------------------------------------------------
Ran 4 tests in 0.001s

FAILED (failures=1)
% ./continent_test.py
..F.
======================================================================
FAIL: test_str (__main__.TestContinent)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "./continent_test.py", line 37, in test_str
    self.assertEqual(str(self.north_america), s)
AssertionError: 'Nort[158 chars]xico has a population of 112336538 and is 1943950 square km.' != 'Nort[158 chars]xico has a population of 112336538 and is 1943950 square km.\n'
  North America
  Canada has a population of 34482779 and is 9984670 square km.
  United States of America has a population of 313914040 and is 9826675 square km.
- Mexico has a population of 112336538 and is 1943950 square km.+ Mexico has a population of 112336538 and is 1943950 square km.
?                                                               +


----------------------------------------------------------------------
Ran 4 tests in 0.001s

FAILED (failures=1)
% ./continent_test.py
....
----------------------------------------------------------------------
Ran 4 tests in 0.000s

OK
% mypy continent.py 
Success: no issues found in 1 source file
% ./continent_test.py -v
test_countries (__main__.TestContinent) ... ok
test_name (__main__.TestContinent) ... ok
test_str (__main__.TestContinent) ... ok
test_total_population (__main__.TestContinent) ... ok

----------------------------------------------------------------------
Ran 4 tests in 0.000s

OK
%

Kamimura's blog

2020年5月30日土曜日

Python - Object-Oriented Programming - Continent, Compositions, Country, population, area, class, methods(init, str)

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