Python - Py Crust: Code Structures(dict, nest, keys method, values method)

Introducing Python

開発環境

• OS X El Capitan - Apple (OS)
• Emacs (Text Editor)
• Python 3.5 (プログラミング言語)

Introducing Python: Modern Computing in Simple Packages (Bill Lubanovic (著)、 O'Reilly Media)のChapter 4(Py Crust: Code Structures)、Things to Do 4.1-12.を取り組んでみる。

Things to Do 4.1-12.

コード(Emacs)

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

print('4.1')
guess_me = 7

if guess_me < 7:
    print('too low')
elif guess_me > 7:
    print('too high')
elif guess_me == 7:
    print('right')
else:
    raise Exception('?')

print('4.2')
guess_me = 7
start = 1

while True:
    if start < 7:
        print('too low')
    elif guess_me == 7:
        print('found it!')
        break
    else:
        raise Exception('?')
    start += 1

print('4.3')
for value in [3, 12, 1, 2]:
    print(value)

print('4.4')
print([n for n in range(10) if n % 2 == 0])

print('4.5')
print({x: x * x for x in range(10)})

print('4.6')
print({x for x in range(10) if x % 2 != 0})

print('4.7')
for s in ('Got {0}'.format(n) for n in range(10)):
    print(s)

print('4.8')


def good():
    return ['Harry', 'Ron', 'Hermione']
print(good())

print('4.9')


def get_odds():
    for x in range(10):
        if x % 2 != 0:
            yield x
for i, n in enumerate(get_odds()):
    if i == 2:
        print(n)
        break

print('4.10')


def test(func):
    def new_fund(*args, **kwargs):
        print('start')
        result = func(*args, **kwargs)
        print('end')
        return result
    return new_fund


@test
def func():
    return 10
n = func()
print(n)

print('4.11')


class OppsException(Exception):
    pass
try:
    raise OppsException('Caught an oops')
except OppsException as err:
    print(err)

print('4.12')
titles = ['Creature of Habit', 'Crewel Fate']
plots = ['A nun turns into a monster', 'A  haunted yarn shop']
movies = dict(zip(titles, plots))
print(movies)

入出力結果(Terminal, IPython)

$ ./sample.py 
4.1
right
4.2
too low
too low
too low
too low
too low
too low
found it!
4.3
3
12
1
2
4.4
[0, 2, 4, 6, 8]
4.5
{0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81}
4.6
{1, 3, 5, 9, 7}
4.7
Got 0
Got 1
Got 2
Got 3
Got 4
Got 5
Got 6
Got 7
Got 8
Got 9
4.8
['Harry', 'Ron', 'Hermione']
4.9
5
4.10
start
end
10
4.11
Caught an oops
4.12
{'Creature of Habit': 'A nun turns into a monster', 'Crewel Fate': 'A  haunted yarn shop'}
$