What are some limitations of Python programming language?

In how many different ways, can you work in Python?

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

Write instructions to get the following result :

Math is Fun so don't be resistant
Just learn the rules, the rules are consistent 
And most important, you must be persistent !

Adding fractions, get common denominators.
Multiply by missing factors to get the denominators. 
Add numerators only, NOT denominators.

Do it in both interactive mode and script mode.