Python - クラスとオブジェクト指向プログラミング(Setクラス)

初めてのPython 第3版
Mark Lutz (著)

開発環境

• OS X Lion - Apple(OS)
• TextWrangler(Text Editor) (BBEditの無料機能制限版、light版)
• Script言語: Python

『初めてのPython 第3版』(Mark Lutz 著、夏目 大 訳、オライリー・ジャパン、2009年、ISBN978-4-87311-393-7) のVI部(クラスとオブジェクト指向プログラミング)のまとめ演習5(Setクラス)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

5.

コード(TextWrangler)

sample.py

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

class Set:
 def __init__(self,value=[]):
  self.data = []
  self.concat(value)
 
 def intersect(self,other):
  res = []
  for x in self.data:
   if x in other:
    res.append(x)
  return Set(res)
 
 def union(self,other):
  res = self.data[:]
  for x in other:
   if not x in res:
    res.append(x)
  return Set(res)
 
 def concat(self,value):
  for x in value:
   if not x in self.data:
    self.data.append(x)
 
 def __len__(self): return len(self.data)
 def __getitem__(self,key):return self.data[key]
 def __and__(self,other): return self.intersect(other)
 def __or__(self,other):return self.union(other)
 def __repr__(self): return "Set: " + repr(self.data)

入出力結果(Terminal)

$ python
Python 3.2.3 (default, Apr 18 2012, 20:17:30) 
[GCC 4.2.1 Compatible Apple Clang 3.0 (tags/Apple/clang-211.12)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from sample import Set
>>> a=Set([1,2,3,4,5])
>>> b=Set([5,6,7,8,9,0,1])
>>> a & b
Set: [1, 5]
>>> a | b
Set: [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
>>> chars = Set("kamimura")
>>> chars[1]
'a'
>>> chars.__getitem__(1)
'a'
>> for x in chars:
...     print(x)
... 
k
a
m
i
u
r
>>> chars
Set: ['k', 'a', 'm', 'i', 'u', 'r']
>>> str = "ka python"
>> chars & str
Set: ['k', 'a']
>>> chars | str
Set: ['k', 'a', 'm', 'i', 'u', 'r', ' ', 'p', 'y', 't', 'h', 'o', 'n']
>>> quit()
$

Setのサブクラスを作成

コード(TextWrangler)

sample.py

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

class Set:
 def __init__(self,value=[]):
  self.data = []
  self.concat(value)
 
 def intersect(self,other):
  res = []
  for x in self.data:
   if x in other:
    res.append(x)
  return Set(res)
 
 def union(self,other):
  res = self.data[:]
  for x in other:
   if not x in res:
    res.append(x)
  return Set(res)
 
 def concat(self,value):
  for x in value:
   if not x in self.data:
    self.data.append(x)
 
 def __len__(self): return len(self.data)
 def __getitem__(self,key):return self.data[key]
 def __and__(self,other): return self.intersect(other)
 def __or__(self,other):return self.union(other)
 def __repr__(self): return "Set: " + repr(self.data)

class Sub(Set):
 def intersect(self,*others):
  res = []
  for x in self:
   for other in others:
    if not x in other:
     break
   else:
    res.append(x)
  return Set(res)
 
 def union(self,*others):
  res = self.data[:]
  for other in others:
   for x in other:
    if not x in res:
     res.append(x)
  return Set(res)

if __name__ == '__main__':
 a = Sub([1,2,3,4,5])
 b = Sub([5,6,7,8,9,0])
 c = Sub([0,1,2,3])
 print(a.intersect(b,c))
 print(a.union(b,c))
 print(a.intersect([1,2],[2,3,4]))
 print(a.union([1,2],[9,10,11,12]))

入出力結果(Terminal)

$ ./sample.py
Set: []
Set: [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
Set: [2]
Set: [1, 2, 3, 4, 5, 9, 10, 11, 12]
$