class_docstr: Base Class for series
docstr: Returns a tuple of variables that are bounded
docstr_tok: ["Returns","a","tuple","of","variables","that","are","bounded"]
code: def variables(self):
      """Returns a tuple of variables that are bounded"""
      return ()
  
file_path: sympy/sympy/series/series_class.py
imports: from sympy.core.expr import Expr
  from sympy.core.singleton import S
  from sympy.core.cache import cacheit
label_desc: Use image node_id 5 for calling the SeriesBase obj's underlying member method code with example usage: obj.variables() and returns: 