<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def visit_tuple(self, node):
 """return an astroid.Tuple node as string"""

        if len(node.elts) == 1:
            return "(%s, )" % node.elts[0].accept(self)
        return "(%s)" % ", ".join(child.accept(self) for child in node.elts)