How to find elements in a dictionary in Python

Context code

smart_girl = {"name":"yuan wai", "age": 25,"sex":"女"}

The first way: []

Note: In this way, if the corresponding key cannot be found , a KeyError will be reported

smart_girl["name"]   #[]传入key

Second method: get method

Note: The get method will not raise KeyError and will return a default value

smart_girl.get("name") #注意：key未指定返回的默认值，找不到对应的key，会返回None

or

smart_girl.get("sex", "找不见性别") #可以指定key不存在时，返回一个指定的默认值

The third way: setdefault method

Note: The setdefualt method will not cause KeyError, the same as the get method

smart_girl.setdefault("name") #未指定默认值，找不到key，会返回None

Or

smart_girl.setdefault("name","无名氏")

or

smart_girl.setdefault("name",default="无名氏") #指定返回默认值，找不到key时，返回默认值

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