How to use the values() method in Python

Usage of values() function in Python

In Python, dictionary is a commonly used data structure used to store key-value pairs. When working with dictionaries, we often need to get all the values ​​in the dictionary. Python provides a built-in function values() that can be used to return all values ​​in the dictionary. This article will introduce the usage of values() function in detail and provide specific code examples.

The syntax of the values() function is as follows:
dict.values()

This function does not receive any parameters and can be called directly. It returns a view object containing all the values ​​in the dictionary. This view object can be used to iterate over all values, or convert them to a list or other collection.

The following is some sample code using the values() function.

Example 1: Iterate over all values ​​in the dictionary

student_scores = {'Alice': 90, 'Bob': 80, 'Cathy': 95}

for score in student_scores.values():
    print(score)

# 输出结果：
# 90
# 80
# 95

In this example, we create a dictionary student_scores to store students' grades. By calling the values() function, we can iterate over all the values ​​in the dictionary and print them out one after another.

Example 2: Use the in keyword to check whether a certain value exists in the dictionary

student_scores = {'Alice': 90, 'Bob': 80, 'Cathy': 95}

if 80 in student_scores.values():
    print("Bob的成绩为80分")

# 输出结果：
# Bob的成绩为80分

In this example, we use the values() function to convert the values ​​in the dictionary into a set, and then Use the in keyword to check if 80 exists in the set. Since Bob's score is 80 points, the condition is established and the corresponding prompt information is printed.

Example 3: Convert the view object returned by the values() function into a list

student_scores = {'Alice': 90, 'Bob': 80, 'Cathy': 95}

score_list = list(student_scores.values())
print(score_list)

# 输出结果：
# [90, 80, 95]

In this example, we use the list() function to convert the view object returned by the values() function into a list. In this way, we can easily perform further operations on the list, such as sorting, slicing, etc.

Summary:
The values() function is an important function in Python for obtaining all values ​​in the dictionary. It can return a view object that can iterate over all values ​​or convert them into other forms of collections. In practical applications, we often need to use the values() function to process values ​​in the dictionary, which makes it easier to operate and process data.

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