Live coding a simple expression parser in python 3
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live coding a simple expression parser in python 3 can be a fun and educational experience. in this tutorial, we will create a basic expression parser that can evaluate simple arithmetic expressions. we will start by defining the grammar for our expressions and then implement the parser using python.
grammar:
an expression can be a single number or a combination of numbers, operators, and parentheses.
supported operators are addition (+), subtraction (-), multiplication (*), and division (/).
parentheses can be used to specify the order of operations.
let's start by defining the grammar as a set of rules:
1. an expression can be a number or an operation.
2. an operation consists of an expression, an operator, and another expression.
3. an expression in parentheses is also considered as an expression.
now, let's implement the expression parser in python:
in this code example, we defined the operator precedence, implemented helper functions to check for operators and perform arithmetic operations, and created the main function to parse and evaluate the expression. this code can handle simple arithmetic expressions with numbers, operators, and parentheses.
during a live coding session, you can run the code, test different expressions, and make improvements or optimizations based on the requirements or feedback. this tutorial provides a basic foundation for building more complex expression parsers or calculators in python.
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