What are the variable types in Python? Mutable and immutable?

In Python, variables can be divided into mutable and immutable types.

Immutable types:

• int, float, complex
• bool
• str (strings)
• tuple
• frozenset
• bytes

Objects of these types cannot be changed after creation — any operations create a new object.

Mutable types:

• list
• dict
• set
• bytearray

These objects can be modified "in place" — adding, removing, or changing elements.

Example:

# Immutable type
s = "hello"
s2 = s.replace('h', 'H')  # a new string is created

# Mutable type
lst = [1, 2, 3]
lst.append(4)  # the list is modified in place

Understanding mutability is important for working with functions, copying objects, and managing state.