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3. Dictionaries ×ÖµäÀàÐÍ
     PythonÖУ¬×ÖµäÀàÐͲ¢²»ÊÇ˳ÐòÈÝÆ÷£¬¶øÀàËÆc++ÖеĹØÁªÈÝÆ÷(map)£¬DictionariesÖд洢µÄÊǼü/Öµ ¶Ô£¬ºÍmap²»Í¬µÄÊÇ£¬PythonµÄDictionariesÖпÉÒÔ´æÈÎÒâ¶ÔÏóÀàÐÍ¡£DictionariesÀàÐÍÒ²ÊǿɱäµÄ£¬ºÍListsÒ»Ñù£¬¿ÉÒÔÔ­µØÐ޸ģ¨Í¨¹ýϱêÐ޸ģ©¡£
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   DictionariesÖ§³ÖǶÌ׶¨Ò壬¼´ËüµÄ¼ü/Öµ¶ÔÖУ¬Öµ»¹¿ÉÒÔʹDictionariesÀàÐÍ»òÕßÊÇListsÀàÐÍ¡£
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±ÈÈçÉèÖãºDict = 0,ÔòÊÍ·ÅDictÕ¼ÓõÄ×ÊÔ´£¬´ËʱPython»áµ÷ÓÃÀ¬»ø´¦Àí»úÖÆÀ´ÊÍ·Å×ÊÔ´¡£
  ×ÖµäÀàÐͲ»ÊÇÐòÁУ¬²¢²»Î¬³Ö´Ó×óµ½ÓÒµÄ˳Ðò£¬±ÈÈ磺
>>> D = {'a':1, 'b':2, 'c':3}
>>> D
{'a': 1, 'c': 3, 'b': 2}
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>>> for key in sorted(D):
print key,'=>', D[key]

a => 1
b => 2
c => 3
>>> D
{'a': 1, 'c': 3, 'b': 2}
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>>> ks = D.keys()
>>> ks.sort()
>>> ks
['a', 'b', 'c']
>>> for key in ks:
print key,'=>',D[key]

a => 1
b => 2
c => 3
>>>
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>>> squares =[x**2 for x in[1, 2, 3, 4,5]]
>>> squares
[1, 4, 9, 16, 25]
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>>> D = {'a':1, 'b':2, 'c':3}
>>> D.has_key('f')
False
>>>


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# Filename: using_sys.py
import sys
print 'The command line arguments are:'
for i in sys.argv:
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from django.template import loader, Context
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Python IDE and GUI Framework for Windows

Pythonwin - Python IDE and GUI Framework for Windows.
Copyright 1994-2006 Mark Hammond
Python is Copyright (c) 2000-2008 ActiveState Software Inc.
Copyright (c) 2001-2008 Python Software Foundation.
All Rights Reserved.
Copyright (c) 2000 BeOpen.com.
All Rights Reserved.
Copyright (c) 1995-20 ......

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www.python.org
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http://www.python.org/ftp/python/2.4.2/python-2.4.2.msi
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