python math expression parser

In this tutorial, we will explore how to create a simple math expression parser in Python. We'll build a parser that can handle basic arithmetic operations, parentheses, and variables. We'll use the eval function for evaluating expressions, but you can also implement your own evaluation logic if needed.
The first step is to tokenize the input expression into meaningful units. We'll define a function tokenize that converts the input expression into a list of tokens.
This regular expression separates the expression into operators (+, -, *, /), parentheses, numbers, and variables.
Next, we'll create a parser that converts the tokens into a parse tree. We'll use a simple recursive descent parser for this purpose.
This parser recognizes expressions, addition, multiplication, parentheses, numbers, and variables.
Now, let's create a function to evaluate the parse tree.
Now, let's use our math expression parser with an example:
This example evaluates the expression (3 + 4) * 2 - x with x set to 5.
Feel free to modify the parser and evaluator to suit your needs or add more functionality, such as support for more operators or functions.
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