How to use Python sets?

In Python, a set is a data structure that is unordered and does not have duplicates. A set can be created using the set() function or curly braces {}.

1. Create an empty set.

my_set = set()

1. Create a collection that contains elements.

my_set = {1, 2, 3, 4, 5}

1. Add elements to the collection.

my_set.add(6)

1. Remove elements from a set.

my_set.remove(3)

1. Check if the collection contains an element.

value = 4
if value in my_set:
    print("集合中包含该元素")
else:
    print("集合中不包含该元素")

1. Iterate through the elements in the collection.

for item in my_set:
    print(item)

1. Create a set using set comprehension.

my_set = {x for x in range(10) if x % 2 == 0}

Please note that sets are unordered, so it is not possible to access elements in a set by index. If you need to process elements in a specific order, you can convert the set to a list or use the sorted() function to sort them.