python 字典遍历

#一、遍历key
test = {'aa': '1a', 'bb': '2b', 'cc': '3c'}
for key in test:
    print 'key is : ',key

key is :  aa
key is :  cc
key is :  bb

for key in test.keys():
    print 'key is : ',key

key is :  aa
key is :  cc
key is :  bb

 

for key in test.iterkeys():
    print 'key is : ',key

key is :  aa
key is :  cc
key is :  bb

 

 

#二、遍历value
for value in test.values():
    print 'value is : ',value

value is :  1a
value is :  3c
value is :  2b

 

for value in test.itervalues():
    print 'value is : ',value

value is :  1a
value is :  3c
value is :  2b

#三、同时遍历键与值
for key,value in test.items():
    print 'key is : ',key,'    value is : ',value

key is :  a     value is :  a
key is :  c     value is :  c
key is :  b     value is :  b

 

for (key,value) in test:
    print 'key is : ',key,'    value si : ',value

key is :  aa     value is :  1a
key is :  cc     value is :  3c
key is :  bb     value is :  2b

 

for (key,value) in test.items():
    print 'key is : ',key,'    value si : ',value

key is :  aa     value si :  1a
key is :  cc     value si :  3c
key is :  bb     value si :  2b

 

#四、遍历键值项
for kv in test.items():
    print 'kv is : ',kv

kv is :  ('aa', '1a')
kv is :  ('cc', '3c')
kv is :  ('bb', '2b')

 

#五、结合zip操作
for k,v in zip(test.keys(), test.values()):
    print 'key is : ',k,'    value is : ',v

key is :  aa     value is :  1a
key is :  cc     value is :  3c
key is :  bb     value is :  2b

 

for kv in zip(test.keys(), test.values()):
    print 'kv is : ',kv

kv is :  ('aa', '1a')
kv is :  ('cc', '3c')
kv is :  ('bb', '2b')