class_docstr: A class representing a modular integer. 
class_docstr_tok: ["A","class","representing","a","modular","integer","."]
code: def __sub__(self, other):
      val = self._get_val(other)
  
      if val is not None:
          return self.__class__(self.val - val)
      else:
          return NotImplemented
  
imports: from __future__ import annotations
  from typing import Any
  import operator
  from sympy.polys.polyutils import PicklableWithSlots
  from sympy.polys.polyerrors import CoercionFailed
  from sympy.polys.domains.domainelement import DomainElement
  from sympy.utilities import public
  from sympy.utilities.exceptions import sympy_deprecation_warning
label_desc: Use image node_id 13 for calling the ModularInteger obj's underlying member method code with example usage: obj.__sub__(other) and returns: self, NotImplemented