What data types in Python cannot be changed after creation?

In Python, immutable data types are those whose values cannot be changed after creation. The main ones include:

• int — integers
• float — floating-point numbers
• bool — boolean values
• str — strings
• tuple — tuples
• frozenset — immutable set

For example, if you have a string, you cannot change a single character; you need to create a new string:

s = "hello"
# s[0] = 'H'  # Error
s = "H" + s[1:]  # Create a new string

Unlike them, lists (list), sets (set), and dictionaries (dict) are mutable data types.