What is the difference between value type and reference type?

In Python, all variables are references to objects, but objects can be mutable or immutable. The difference between value type and reference type in Python can be explained as follows:

• Value type — a variable directly contains data. Python does not have such types in the traditional sense, like in C++ or Go.

• Reference type — a variable contains a reference to an object in memory. In Python, all objects are passed and assigned by reference.

For example, for mutable objects (lists, dictionaries), changes through one variable are reflected in all references:

lst1 = [1, 2, 3]
lst2 = lst1
lst2.append(4)
print(lst1)  # [1, 2, 3, 4]

For immutable objects (numbers, strings), changing creates a new object:

a = 10
b = a
b += 5
print(a)  # 10
print(b)  # 15

Thus, in Python, the concepts of "value type" and "reference type" are not explicitly separated; it is important to understand object mutability and reference behavior.