## 2014年7月18日金曜日

### Python - 並び替え(sort(list), sorted(builtin), key, reverse)

Head First C ―頭とからだで覚えるCの基本(David Griffiths (著)、Dawn Griffiths (著) 中田 秀基(監訳)(翻訳)、木下 哲也 (翻訳)、オライリージャパン)の7章(高度な関数: 関数を最大限に活用する)、長いエクササイズ(p.328)をpythonで考えてみる。

コード(BBEdit, Emacs)

sample328.py

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

class Rectangle:
def __init__(self, width, height):
self.width = width
self.height = height

@property
def area(self):
return self.width * self.height
def __str__(self):
return '{0}x{1}'.format(self.width, self.height)

def p(items):
for item in items:
print(item, end=' ')
print()

scores = [543, 323, 32, 554, 11, 3, 112]
recs = [Rectangle(1, 5), Rectangle(1, 1), Rectangle(1, 4), Rectangle(1, 2),
Rectangle(1, 3)]
names = ["abcd", "Dabc", "bcda", "Cdab", "Bcda", "Abcd", "cdab", "dabc"]

p(scores)
p(recs)
p(names)

print('昇順')
p(sorted(scores))
p(sorted(recs, key=lambda r: r.area))
p(sorted(names))

print()
p(scores)
p(recs)
p(names)

print('降順')
p(sorted(scores, key=lambda x: -x))
p(sorted(recs, key=lambda r: -r.area))

print()
p(scores)
p(recs)
p(names)

print('降順')
p(sorted(scores, reverse=True))
p(sorted(recs, key=lambda r: r.area, reverse=True))
p(sorted(names, reverse=True))
```

```\$ ./sample328.py
543 323 32 554 11 3 112
1x5 1x1 1x4 1x2 1x3
abcd Dabc bcda Cdab Bcda Abcd cdab dabc

3 11 32 112 323 543 554
1x1 1x2 1x3 1x4 1x5
Abcd Bcda Cdab Dabc abcd bcda cdab dabc

543 323 32 554 11 3 112
1x5 1x1 1x4 1x2 1x3
abcd Dabc bcda Cdab Bcda Abcd cdab dabc

554 543 323 112 32 11 3
1x5 1x4 1x3 1x2 1x1

543 323 32 554 11 3 112
1x5 1x1 1x4 1x2 1x3
abcd Dabc bcda Cdab Bcda Abcd cdab dabc

554 543 323 112 32 11 3
1x5 1x4 1x3 1x2 1x1
dabc cdab bcda abcd Dabc Cdab Bcda Abcd
\$
```