NPI NPI is a simple calculator that supports Reverse Polish Notation.
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reverse scientific calculator polish notation Reverse Polish Notation RPN mode

NPI Description

NPI is a simple calculator that supports Reverse Polish Notation. NPI is a simple calculator that supports Reverse Polish Notation, devised by Jan Lukasiewicz in the Twenties to allow evaluation of mathematical expressions without brackets. NPI calculator supports completion and command history.In the Twenties, Jan Lukasiewicz developed a system of formal logic making itpossible the mathematical expressions to be indicated without brackets whileplacing the operators avant (notation of prefix) or after (notation of suffix)the operands.The notation of suffix is named Polish notation reversed (RPN = ReversePolish Notation) in the honor of Lukasiewicz.With this program you will be able to calculate maths expression in the Unixshell using the RPN notation and with historic and completion support.Requirements:· Python 2.1 or later.Usage:Simply run:$ python -O npi.pyWhat's New in This Release:· Some new commands and aliases were added.· A command read from the command line may now be executed.

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