code: def _print_set(self, expr):
      if not expr:
          return "set()"
      return "{%s}" % self.reprify(expr, ", ")
  
imports: from __future__ import annotations
  from typing import Any
  from sympy.core.function import AppliedUndef
  from sympy.core.mul import Mul
  from mpmath.libmp import repr_dps, to_str
  from .printer import Printer, print_function
label_desc: Use image node_id 25 for calling the ReprPrinter obj's underlying member method code with example usage: obj._print_set(expr) and returns: unknown, str