What are advantages/disadvantages of working in Interactive mode in Python?

Write Python statement for the following in interactive mode:

1. To display sum of 3, 8.0, 6*12
2. To print sum of 16, 5.0, 44.0

Write the output of the following:

num1 = 4 
num2 = num1 + 1 
num1 = 2
print(num1, num2)

What are some limitations of Python programming language?