The set() function plays an important role in Python, allowing you to easily create, manipulate, and transform collections.
set() is a built-in function in Python for creating collections.
This article will provide a comprehensive introduction to the use of set(), demonstrate its functionality with examples, and demonstrate its importance and practical application in data manipulation.
set() function.
In Python programming, the set() function is used to create an unordered collection of distinct elements.
A collection is a data structure that can contain any type of object, such as numbers, strings, lists, and so on.
The set() function returns a collection object that can be used for various collection operations.
Usage of the set() function.
Create a collection: Use the set() function to create an empty collection, or convert an iterable object to a collection. For example:
Create an empty set = set() to convert the list to a collection my list = [1, 2, 3, 2, 4, 2] my set = set(my list) The result is , removing the duplicate elements.
Add an element: You can use the add() method to add an element to a collection. For example:
my_set = my_set.add(4) The result is:
Delete an element: You can use the remove() method to remove an element from a collection. If the element does not exist, a keyerror exception is thrown.
To avoid exceptions, you can use the discard() method to delete an element that doesn't exist, or use the pop() method to delete an element randomly. For example:
my_set = my_set.remove(3) result
Set operations. Intersection, union, and difference: You can use standard operators and built-in functions for set operations. For example:
set1 = set2 = intersection intersection = set1 & set2 The result is
Union = set1 |set2 result
Difference (elements that belong to the first set but are not in the second set) difference = set1 - set2 The result is
Collection-related usage.
Determine whether an element exists: You can use the in operator or the not in operator to determine whether an element exists in a collection. For example:
My set = print(2 in my set) outputs true print(6 not in my set) outputs true
Traversing a Collection: You can use a for loop to iterate through elements in a collection. For example:
My Set = for Element in My Set: (tab)print(element) output.
Summary. In practical applications, the set() function can be used in various scenarios such as deduplication, determining whether an element exists, and set operations.
By mastering the use of the set() function, we can work with data more flexibly and improve the efficiency and readability of the data.