Set is collection type in python like List but more restricted than list type. Such as,

1. Set is unordered
2. No duplicate entries/elements allowed
3. Immutable (not changeable but you can add or remove elements from set)
4. Un-indexed

Syntax to create a set:

# using curely brackets

set_name = {"First", "Second", "Third"}

# using set() constructor

set_name = set(("First", "Second", "Third"))

# Creating a set and print the elements

languages = {"Java", "Python", "C++"}
print(languages)

# Output:

{'C++', 'Python', 'Java'}

# A set elements can be different types

Here we create a set of string, int, boolean

demo_set = {"Java", 'Honda', 25, True, False}
print(demo_set)

# Output

{False, True, 25, 'Java', 'Honda'}

Yes, you got the above result as set type is unordered.

# No duplicate elements allowed

Though you don't get any compile time error, hence the duplicate elements will be eliminated automatically by the compiler.

unique_names = {"Mark", "Helena", "Jenkov", "Mark"}
print(unique_names)

# Output:
{'Helena', 'Jenkov', 'Mark'}

Note: Boolean value like True is considered 1 and False is considered 0. So what output you will get from the below example?

demo_set = {"Java", 1, False, 0, True}
print(demo_set)

# Output:
{False, 1, 'Java'} # Possible to get different result in your compiler

# Using for loop

We can simply loop through or iterate set elements using for loop.

languages = {"Java", "Python", "C++", "Rust", "JavaScript"}

for x in languages:
    print(x)

If you run the above python file, you will get the following output (not that it doesn't maintain insertion order)

Python
C++
Java
Rust
JavaScript