Question 1 (Exercise 7.2 from Think Python 2nd Edition by Allen Downey) Built-in

Question

Question 1 (Exercise 7.2 from Think Python 2nd Edition by Allen Downey) Built-in function eval takes a string and evaluates it using the Python interpreter. For example: >>eval('1 + 2* 3') >>>import math eval'math.sqrt(5)") 2.23606797749979 eval'type (math.pi)") Write a fucntion called eval_loop that iteractively 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 returns the value of the last expression it evaluated.

Explanation / Answer

# The built-in function eval takes a string and evaluates it using the Python interpreter.
def eval_loop():
while True:
n = raw_input('Input? :: ')
if n == 'done':
break
else:
result = eval(n)
print result
print result

eval_loop()

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