Determines if value character length equal self.length.
        Keyword arguments:
        value str -- the value of the associated field to compare

def run(self, value):
        """ Determines if value character length equal self.length.
        Keyword arguments:
        value str -- the value of the associated field to compare
        """
        if self.pass_ and not value.strip():
            return True

        if len((value.strip() if self.strip else value)) != self.length:
            self.error = self.error.format(value, self.length)
            return False
        return True