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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def execute(self, sql, param=(), times=1):
 """This function is the most use one, with the paramter times it will try x times to execute the sql, default is 1. """

        self.log and self.log.debug('%s %s' % ('SQL:', sql))
        if param is not ():
            self.log and self.log.debug('%s %s' % ('PARAMs:', param))
        for i in xrange(times):
            try:
                ret, res = self._execute(sql, param)
                return ret, res
            except Exception, e:
                self.log and self.log.warn("The %s time execute, fail" % i)
                self.log and self.log.warn(e)
            if i: sleep(i**1.5)
        self.log and self.log.error(e)
        return None, e