
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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*in Python
The built-in function eval takes a string and evaluates it using the Python interpreter. For example:
>>> eval('1 + 2 * 3') 7
>>> import math
>>> eval('math.sqrt(5)')
2.2360679774997898
>>> eval('type(math.pi)')
<class 'float'>
Write a function called eval_loop that iteratively prompts the user, takes the resulting input and evaluates it using eval, and prints the result.
It should continue until the user enters 'done', and then return the value of the last expression it evaluated.
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