Reverse Polish Notation Calculator Python

Originally it had just 4 operators using import operator and a lookup table and only did integers. After looking at some example calculations i amended it to work on floats and added a raising to powers. Reverse polish notation calculator written in python.

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This is a coding example program an rpn caculator it s meant to show some python techniques and capabilities.

Reverse polish notation calculator python. Rpn py a reverse polish notation calculator for python here is rpn py a script implementing a reverse polish notation rpn calculator for python. I m trying to modify this reverse polish notation calculator. Postfix notation is said to be harder to learn but have several advantages when used on. The basic idea is that one places the required arguments onto a stack then invokes an operation that needs the arguments.

This tool gives you a way to change between infix seen normally in most writing and post fix also known as reverse polish notation or polish postfix notation which is used in some hp calculators such as the 9100a and hp 35. A reverse polish notation calculator in python. The source code is. Your job is to create a calculator which evaluates expressions in reverse polish notation.

Reverse polish evaluator in python. This implementation comes from this excellent article ll and lr parsing demystified. Empty expression should evaluate to 0. A reverse polish notation rpn system is a parenthesis free way to perform calculations.

I ve done nearly all of it but it s not printing the way i want and i can t figure out why. For your convenience the input is formatted such that a space is provided between every token. As well as providing for traditional numeric calculator operations it provides easy access to many python functions and you can put python objects and functions onto the stack and operate on them. Here is an implementation in python of a simple arithmetic evaluator that evaluates expressions in reverse polish notation.

After reading the definition i made a simple reverse polish notation rpn calculator in python. Reverse polish notation calculator in python. Instantly share code notes and snippets. For example expression 5 1 2 4 3 which is equivalent to 5 1 2 4 3 in normal notation should evaluate to 14.