<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def complex_exists(self, complex: str) -> bool: """ Shortcut to check if complex exists in our database. """

        try:
            self.check_complex(complex)
        except exceptions.RumetrComplexNotFound:
            return False

        return True