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2. evaluate Takes a valid bimmy++ expression and evaluates it! (you only have to handle valid bimmy++ expressions here -- they have already been validated by validate, above) If the expression is an integer, just return that integer! If the expression describes a computation (ie, it is a list), then recursively evaluate its children (the operands for the computation). "add", "sub", and "mul" are pretty straightforward, but some care needs to be taken with "div". Make sure that "div" does integer division (use Python's // operator), and if you are about to divide by 0, raise a ValueError with the message "divide by zero".

2. evaluate Takes a valid bimmy++ expression and evaluates it! (you only have to handle valid bimmy++ expressions here -- they have already been validated by validate, above) If the expression is an integer, just return that integer! If the expression describes a computation (ie, it is a list), then recursively evaluate its children (the operands for the computation). "add", "sub", and "mul" are pretty straightforward, but some care needs to be taken with "div". Make sure that "div" does integer division (use Python's // operator), and if you are about to divide by 0, raise a ValueError with the message "divide by zero".

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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1. validate Takes anything at all (any Python value) and returns True if that value is a valid bimmy++ expression. A Python value is a valid bimmy++ expression if it is either an integer or a list describing a computation (in the way described above -- make sure to recursively check the children!). This function will always either return True or raise a ValueError. For style points (which don't affect your grade, just your reputation), put helpful error messages in your ValueError objects! 2. evaluate Takes a valid bimmy++ expression and evaluates it! (you only have to handle valid bimmy++ expressions here -- they have already been validated by validate , above) If the expression is an integer, just return that integer! If the expression describes a computation (ie, it is a list), then recursively evaluate its children (the operands for the computation). "add", "sub", and "mul" are pretty straightforward, but some care needs to be taken with "div". Make sure that "div" does integer division (use Python's // operator), and if you are about to divide by 0, raise a ValueError with the message "divide by zero".
Transcribed Image Text:1. validate Takes anything at all (any Python value) and returns True if that value is a valid bimmy++ expression. A Python value is a valid bimmy++ expression if it is either an integer or a list describing a computation (in the way described above -- make sure to recursively check the children!). This function will always either return True or raise a ValueError. For style points (which don't affect your grade, just your reputation), put helpful error messages in your ValueError objects! 2. evaluate Takes a valid bimmy++ expression and evaluates it! (you only have to handle valid bimmy++ expressions here -- they have already been validated by validate , above) If the expression is an integer, just return that integer! If the expression describes a computation (ie, it is a list), then recursively evaluate its children (the operands for the computation). "add", "sub", and "mul" are pretty straightforward, but some care needs to be taken with "div". Make sure that "div" does integer division (use Python's // operator), and if you are about to divide by 0, raise a ValueError with the message "divide by zero".
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