a = {'a': '1', 'b': '2', 'c': '3'}
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# （1）遍历key值
for key in a:
print(key+':'+a[key])
for key in a.keys():
print(key+':'+a[key])
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# （2）遍历value值
for value in a.values():
print(value)
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# （3）遍历字典项
for kv in a.items():
print(kv)
>>>('a', '1')
>>>('b', '2')
>>>('c', '3')
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# （4）遍历字典健值
for key,value in a.items():
print(key+':'+value)
for (key,value) in a.items():
print(key+':'+value)
>>>a:1
>>>b:2
>>>c:3
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