How to create my own exception for brackets?

[Armando Santiag]

i want to create my own exception with code saying whether or not someone has entered a ) after a (, for example (jdduu) is ok, but hkbvbhb)hkhb(, is not, how would i start

[bvdet]

First you would create an algorithm to determine if the user entered unbalanced parentheses. You don't really need a user-defined exception. Just raise an exception based on a certain condition. But if you want to:

class UnbalancedParenthesesError(Exception):
    pass

class NoParenthesesError(Exception):
    pass

def getinput(prompt="Enter input enclosed by parentheses"):
    s = raw_input(prompt)
    i = s.find("(")
    j = s.find(")")
    if i < 0 or j < 0:
        raise NoParenthesesError("You left off the parentheses")
    elif j < i:
        raise UnbalancedParenthesesError("Your parentheses are unbalanced")
    return s

print getinput()

[Armando Santiag]

this method works for single parentheses for example (hcvhkdb), but not for parentheses within parentheses (jcdbjkbdcjb(23 8))

[bvdet]

My example was never intended to be a solution. It was intended to be an example of a user-defined exception.

[Armando Santiag]

your solution helped alot wit another exception i was working on, but im going to continue to try the brackets, will post if i come up with something