The difference between dictionary SetDefault and get methods in Python

The difference between setdefault and get methods in Python

d = {‘name‘:‘Liu‘, ‘sex‘:‘male‘}d.get(‘age‘, 15) # d 不变d.setdefault(‘age‘, 15) # d 增加一个键值对

Name implies

• getMethod gets key A value of 15 when not being specified , it does not set the dictionary itself, but simply returns a specified value
• setdefaultThe method is to set the unknown in the dictionary key value to the value we specify, when the value is not specified manually, None and it returns a reference to the specified value to the user, and if the value is a variable sequence, the sequence can be manipulated directly.

d = {}d.setdefault(‘list‘, []).append(‘10‘)

dThe value changes to

 {‘list‘: [‘10‘]}

The difference between dictionary SetDefault and get methods in Python