STY: Tiny refactor (#2901)

Functions insert_blank_page and _pdf_objectify.

pypdf/_writer.py

@@ -677,7 +677,7 @@ def insert_blank_page(
  PageSizeNotDefinedError: if width and height are not defined
  and previous page does not exist.
  """
- if width is None or height is None and (self.get_num_pages() - 1) >= index:
+ if width is None or height is None and index < self.get_num_pages():
  oldpage = self.pages[index]
  width = oldpage.mediabox.width
  height = oldpage.mediabox.height
@@ -3244,18 +3244,18 @@ def _pdf_objectify(obj: Union[Dict[str, Any], str, int, List[Any]]) -> PdfObject
  casted_value = _pdf_objectify(value)
  to_add[name_key] = casted_value
  return to_add
- elif isinstance(obj, list):
- return ArrayObject(_pdf_objectify(el) for el in obj)
  elif isinstance(obj, str):
  if obj.startswith("/"):
  return NameObject(obj)
  else:
  return TextStringObject(obj)
  elif isinstance(obj, (int, float)):
  return FloatObject(obj)
+ elif isinstance(obj, list):
+ return ArrayObject(_pdf_objectify(i) for i in obj)
  else:
  raise NotImplementedError(
- f"type(obj)={type(obj)} could not be casted to PdfObject"
+ f"{type(obj)=} could not be cast to a PdfObject"
  )