Python笔记——字典

创建字典

>>> names={'Tom':'Tom is very good.','Jack':'Jack is very tall.'}
>>> names
{'Tom': 'Tom is very good.', 'Jack': 'Jack is very tall.'}
>>> 

字典查询

>>> print(names['Jack'])
Jack is very tall.
>>> 

在字典查询的过程中遇到没有的key，我们可能会遇到程序出现崩溃的情况，所以查询的时候更加建议用get()方法查询，代码示例：

>>> print(names.get('Mary'))
None
>>> 

字典get()自定义返回值

>>> names.get('Mary','There is no such person.')
'There is no such person.'
>>>