Hi, here's your problem today. This problem was recently asked by Google:
Given a mathematical expression with just single digits, plus signs, negative signs, and brackets, evaluate the expression. Assume the expression is properly formed.
Input: - ( 3 + ( 2 - 1 ) ) Output: -4
Here's the function signature:
def eval(expression): # Fill this in. print eval('- (3 + ( 2 - 1 ) )') # -4