What is the purpose of values ​​method?

The values() method is a method of the dictionary object in Python. It returns a view of all the values ​​in the dictionary. This view is a list-like object that can be used to iterate over all values ​​in the dictionary.

The main function of the values() method is to obtain all values ​​in the dictionary, excluding the corresponding keys. By using the values() method, we can easily access and manipulate the values ​​in the dictionary without caring about their corresponding keys.

The following is a simple example showing the use of the values() method:

# 创建一个字典
student_scores = {'小明': 95, '小红': 88, '小王': 92}

# 使用values()方法获取所有值的视图
scores = student_scores.values()

# 遍历所有值并打印
for score in scores:
    print(score)

Running the above code will output:

95
88
92

In this example, we first create A dictionary student_scores is created, which contains the students' names (keys) and test scores (values).

Then, we use the values() method to get the view of all student scores and assign them to the variable scores. Next, we use a for loop to iterate through the view and print each value.

It is worth noting that the values() method returns a view object, not a direct list, but it can be traversed like a list. This means that when the values ​​in the dictionary change, the view will also change. Therefore, if you need to get a list of values ​​that is not affected by dictionary changes, you can use the list() function to convert the view to a list, as shown below:

# 创建一个字典
student_scores = {'小明': 95, '小红': 88, '小王': 92}

# 使用values()方法获取所有值的视图
scores = student_scores.values()

# 将视图转换为列表
scores_list = list(scores)

# 修改字典中的值
student_scores['小明'] = 100

# 打印列表
print(scores_list)

Running the above code will output:

[88, 92, 100]

As shown above, even if we modify the value in the dictionary, the value of the list scores_list is not affected.

In summary, the values() method is a view used to obtain all values ​​in the dictionary. It allows us to conveniently loop through all values ​​and perform corresponding operations. But keep in mind that this view is dynamic, and when the values ​​in the dictionary change, the view will change accordingly. If you need to get a list of values ​​that is not affected by dictionary changes, you can use the list() function to convert the view.

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