Python - Statements and Syntax(Program logic alternatives)

Learning Python
(Oreilly & Associates Inc)
Mark Lutz (著)
(邦訳版)

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)

Learning Python (Mark Lutz (著)、Oreilly & Associates Inc)のPART Ⅲ.(Statements and Syntax)、Test Your Knowledge: Part Ⅲ Exercises、4-a, b, c, d, e, f.(Program logic alternatives)を解いてみる。

その他参考書籍

• Pythonチュートリアル 第2版
• Python クックブック 第2版 (原書(最新版))
• Programming Python
• Python Pocket Reference (Pocket Reference (O'Reilly))

4-a, b, c, d, e, f.(Program logic alternatives)

コード(BBEdit)

sample4.py

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

# a.
l = [1, 2, 4, 8, 16, 32, 64]
x = 5

print('a.')
i = 0
while i < len(l):
    if 2 ** x == l[i]:
        print('at index', i)
        break
    i += 1
else:
    print(x, 'not found')

print('b.')
for n in l:
    if 2 ** x == n:
        print('at index', l.index(n))
        break
else:
    print(x, 'not found')

print('c.')
if 2 ** x in l:
    print('at index', l.index(2 ** x))
else:
    print(x, 'not found')

print('d.')
l1 = []
for x in range(7):
    l1.append(2 ** x)
print(l1)

print('e.')
# yes
n = 2 ** x
if n in l:
    print('at index', l.index(n))
else:
    print(x, 'not found')

print('f.')
m = map(lambda x: 2**x, range(7))
print(m)
print(list(m))

l2 = [2 ** x for x in range(7)]
print(l2)

入出力結果(Terminal, IPython)

$ ./sample4.py
a.
at index 5
b.
at index 5
c.
at index 5
d.
[1, 2, 4, 8, 16, 32, 64]
e.
at index 6
f.
<map object at 0x10276fc88>
[1, 2, 4, 8, 16, 32, 64]
[1, 2, 4, 8, 16, 32, 64]
$