Can you list immutable data types used in Python?

In Python, immutable (unchangeable) data types are objects whose state cannot be modified after creation. The main immutable types include:

• int — integers
• float — floating-point numbers
• complex — complex numbers
• bool — boolean values (True, False)
• str — strings
• tuple — tuples
• frozenset — immutable set
• bytes — immutable sequence of bytes

Example:

x = (1, 2, 3)
# Cannot change an element of the tuple
# x[0] = 10  # will raise an error

s = "hello"
# s[0] = 'H'  # also an error

fset = frozenset([1, 2, 3])
# fset.add(4)  # error, because frozenset is immutable

Immutability is useful for using objects as dictionary keys, set elements, and for data security.