A simple expression evaluator

• Supports multi-character names as variables
• Supports arithmetic operators +-*/^ and unary minus
• Supports bracketed expressions

Implements a Stack class using dque

Implements a Lexer class that performs tokenization

Postfix conversion is performed and the postfix expression is evaluated

Example usage

import evaluator

ex = evaluator.ExpressionProcessor({'a':10,'b':20, 'var':2})
result = ex.calculate('1+(2^3-4)+a-b')
print(f"Result:{result}")