python：从字典中打印值
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python: print values from a dictionary
提问by l--''''''---------''''''''''''
generic_drugs_mapping={'MORPHINE':[86],
'OXYCODONE':[87],
'OXYMORPHONE':[99],
'METHADONE':[82],
'BUPRENORPHINE':[28],
'HYDROMORPHONE':[54],
'CODEINE':[37],
'HYDROCODONE':[55]}
How do I return 86?
我如何返回86？
This does not seem to work:
这似乎不起作用：
print generic_drugs_mapping['MORPHINE'[0]]
采纳答案by Andrew
The list is the value stored under the key. The part that gets the value out is generic_drugs_mapping['MORPHINE']so this has the value [86]. Try moving the index outside like this :
列表是存储在键下的值。获取值的部分是generic_drugs_mapping['MORPHINE']so this 具有 value [86]。尝试像这样将索引移到外面：
generic_drugs_mapping['MORPHINE'][0]
回答by Greg Hewgill
You have a bracket in the wrong place:
你在错误的地方有一个括号：
print generic_drugs_mapping['MORPHINE'][0]
Your code is indexing the string 'MORPHINE', so it's equivalent to
您的代码正在索引 string 'MORPHINE'，因此它相当于
print generic_drugs_mapping['M']
Since 'M'is not a key in your dictionary, you won't get the results you expect.
由于'M'不是字典中的键，因此您不会得到预期的结果。
