Create a file lab3.py and import your Stack class to implement the following exercise. Test your implementation of this exercise

1. Implement an In2PostFix Translator (listing 3.7) and a PFInterpreter (try to write it yourself without looking at the solution in the book -- then compare your program with the book's code!)

   (a) Implement your code so it converts/processes postfix expressions using multi-digit numbers (rather than single-char variables)

Note: It must be written in python programming