What is the usage of the Python dictionary get function…

The get() method of a dictionary is used to retrieve the value of a specified key in the dictionary. It takes two parameters: the first parameter is the key to retrieve, and the second parameter is an optional default value to return if the specified key does not exist in the dictionary.

Grammar:

字典.get(键, 默认值)

Original: 我学了英语，所以现在我可以跟外国人交流。

Paraphrased: I have studied English, so now I can communicate with foreigners.

person = {'name': 'Alice', 'age': 25, 'city': 'New York'}

name = person.get('name')
print(name)  # 输出：Alice

gender = person.get('gender', 'unknown')
print(gender)  # 输出：unknown

age = person.get('age', 30)
print(age)  # 输出：25

salary = person.get('salary')
print(salary)  # 输出：None

In the above example, the get() method is used to retrieve the value of a specified key in a dictionary, and a default value can be specified. If the specified key exists, it will return the corresponding value; if the specified key does not exist, it will return the default value. If no default value is specified, it will return None.