Validates that brackets are properly aligned

bracket_validator.py

def bracket_validator(arg):
    openers = []
    for char in arg:
    	if char == '(':
            openers.append('paren')
        elif char == '{':
            openers.append('curly')
        elif char == '[':
            openers.append('square')
        elif char == ')':
            if openers[-1] != 'paren':
                return False
            else:
                del openers[-1]
        elif char == '}':
            if openers[-1] != 'curly':
                return False
            else:
                del openers[-1]
        elif char == ']':
            if openers[-1] != 'square':
                return False
            else:
                del openers[-1]
    print "Running with " + arg
    return True

# run your function through some test cases here
# remember: debugging is half the battle!
print bracket_validator('test input')
print bracket_validator('{ [ ] ( ) }')
print bracket_validator('{ [ ( ] ) }')
print bracket_validator('{ [ }')