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d = { 'x':42, 'y':3.14, 'z':7 } 
d['x']                          
# 42
d['z']                          
# 7
d['a']                          
# raises exception
ƽÕû¸³Öµµ½Ò»¸öʹÓû¹²»ÔÚ×ÖµäÖеļüµÄË÷Òý£¨ÀýÈ磬D[newkey]=value£©ÊÇÒ»¸ö¿ÉÐеIJÙ×÷£¬¸Ã²Ù×÷¼ÓÔØ¼üºÍÖµµ½×ÖµäÀïеÄÏîÄ¿ÖС£ÀýÈ磺
d = { 'x':42, 'y':3.14, 'z':7 } 
d['a'] =
16                     
# d is now {'x':42,'y':3.14,'z':7,'a':16}
del
D[k]ÖеÄdelÓï¾ä£¬É¾³ý×ÖµäÖÐÓµÓмükµÄÏîÄ¿¡£Èç¹ûk²»ÊÇ×ÖµäDÖеļü£¬del
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×Öµä¶ÔÏóÌṩÁ˶àÖÖ·½·¨£¬Èçϱí¸ñËùʾ¡£·Ç±äÒì·½·¨·µ»Ø½á¹û£¬µ«²»¸Ä±äËüÃÇʹÓõĶÔÏó¡£ÔÚÏÂÃæÁбíÖУ¬DºÍD1´ú±íÈκÎ×Öµä¶ÔÏó£¬k´ú±íDÖÐÈκÎÓÐЧµÄ¼ü£¬xΪÈκζÔÏó¡£
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Non-mutating methods
D.copy( )
Returns a (shallow) copy of the dictionary
D.has_key(k)
Returns True if k is a key in D, otherwise returns False
D.items( )
Returns a copy of the list of all items (key/value pairs) in
D
D.keys( )
Returns a copy of the list of all keys in D
D.values( )
Returns a copy of the list of all values in D
D.iteritems( )
Returns an iterator on all items(key/value pairs) in D
D.iterkeys( )
Returns an iterator o


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