code: def replace(parent, idx, value, check_value=_NO_VAL):
    
    if isinstance(parent, dict):
      if idx not in parent:
        raise JSONPatchError("Item does not exist")
    elif isinstance(parent, list):
      idx = int(idx)
      if idx < 0 or idx >= len(parent):
        raise JSONPatchError("List index out of range")
    if check_value is not _NO_VAL:
      if parent[idx] != check_value:
        raise JSONPatchError("Check value did not pass")
    parent[idx] = value
docs: Replace a value in a dict.