aDict = {'key1':'value1', 'key2':'value2', 'key3':'value3'}print '-----------dict-------------'for d in aDict:  print "%s:%s" %(d, aDict[d])print '-----------item-------------'for (k,v) in aDict.items():  print '%s:%s' %(k, v)#效率最高print '------------iteritems---------'for k,v in aDict.iteritems():  print '%s:%s' % (k, v)#最笨的方法print '---------iterkeys---------------'for k in aDict.iterkeys():  print '%s:%s' % (k, aDict[k])print '------------iterkeys, itervalues----------'for k,v in zip(aDict.iterkeys(), aDict.itervalues()):  print '%s:%s' % (k, v)

<pre name="code" class="python">-----------dict-------------key3:value3key2:value2key1:value1-----------item-------------key3:value3key2:value2key1:value1------------iteritems---------key3:value3key2:value2key1:value1---------iterkeys---------------key3:value3key2:value2key1:value1------------iterkeys, itervalues----------key3:value3key2:value2key1:value1