code: def visit_exec(self, node):
          
          if node.locals:
              return "exec %s in %s, %s" % (
                  node.expr.accept(self),
                  node.locals.accept(self),
                  node.globals.accept(self),
              )
          if node.globals:
              return "exec %s in %s" % (node.expr.accept(self), node.globals.accept(self))
          return "exec %s" % node.expr.accept(self)
docs: return an astroid.Exec node as string