How to remove duplicates from a list using Python's set() function

In daily programming, we often encounter situations where we need to remove duplicate items from a list, and Python’s set (set) function provides a simple and efficient way to achieve this. Target. This article will introduce how to use Python's set() function to remove duplicates from a list and provide corresponding code examples.

1. Python’s set() function

In Python, the set() function is a built-in function used to create an unordered collection of non-repeating elements. Its basic syntax is as follows:

set(iterable)

where iterable is an iterable object, such as a list, tuple or string, and the set() function treats these elements as elements of the set . If there are duplicate elements in the iterable, only one copy will be kept in the collection.

It should be noted that the syntax for creating an empty collection is set() instead of {}, because {} is used to create an empty dictionary in Python.

2. Use the set() function to remove duplicates from a list

Consider the following simple list, which contains some duplicates:

my_list = [1, 3, 5, 7, 1, 2, 3, 5]

We can Use the set() function to remove these duplicates and store the result in a new list:

unique_list = list(set(my_list))

Here, we first pass my_list to the set() function to create a collection object, and then use list () function converts it back to a list. This will automatically remove duplicates from the list. Output unique_list and get the result:

[1, 2, 3, 5, 7]

We can see that unique_list no longer contains duplicate elements. This method is extremely simple and efficient, can handle large lists, and has extremely high performance.

3. Code Example

The following is a complete Python example demonstrating how to use the set() function to remove duplicates from a list:

# 定义一个包含重复项的列表
my_list = [1, 3, 5, 7, 1, 2, 3, 5]

# 使用set()函数去除重复项，并将其转换回列表
unique_list = list(set(my_list))

# 输出新列表
print("原始列表: ", my_list)
print("去重后列表: ", unique_list)

Output The results are as follows:

原始列表:  [1, 3, 5, 7, 1, 2, 3, 5]
去重后列表:  [1, 2, 3, 5, 7]

This example shows how to use the set() function to remove duplicates in a list, showing a simple code example and clear output results.

4. Summary

Python’s set() function is a very useful function that can be used to quickly remove duplicates from a list. Using it is not only simple and easy to understand, but also efficient and fast. With the introduction in this article, you should be able to easily apply the set() function in your own code to remove duplicates from a list.

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