python遍历字典的几种方法

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)