Implement the parse_math in the file linked above. We wrote tests for this function in class. Use the unit tests to guide your implementation and keep in mind that all of the tests we wrote need to pass in order for your code to be considered correct.
Submit your implementation on Moodle.
You can run the doctests from the command line using the Pytest tool.
pytest --doctest-modules parse_math.pyRemember that passing the tests is a necessary, but not sufficient condition to demonstrate program correctness. Keep an eye out for situations not covered by the tests and feel free to add test cases.
You will likely want to process one character at a time. Parsers are often written to be “stateful”. This means that as you process an additional character you decide how to treat that character based on the characters you’ve seen previously.
For example, operands can consist of more than one character. This means that when we come upon a digit we can’t just assume that’s the entire operand and convert it to an int, we have to wait to see if the integer has additional digits.
By the same token (get it?), when we run into an operator, we know that we can process it immediately, but we may have already been in the midst of processing a multi-character operand, so we have to close out any existing operand processing (convert the characters to an integer) before we can handle the operator.