expand variables

pypdf/_page.py

@@ -440,15 +440,15 @@ def _get_ids_image(
         else:
             call_stack.append(_i)
         if self.inline_images_keys is None:
-            st = self._get_contents_as_bytes() or b""
+            content = self._get_contents_as_bytes() or b""
             nb_inlines = 0
-            for ma in re.finditer(
+            for matching in re.finditer(
                 WHITESPACES_AS_REGEXP + b"BI" + WHITESPACES_AS_REGEXP,
-                st,
+                content,
             ):
-                st1 = st[: ma.start()]
-                if len(re.findall(b"[^\\\\]\\(", st1)) == len(
-                    re.findall(b"[^\\\\]\\)", st1)
+                start_of_string = content[: matching.start()]
+                if len(re.findall(b"[^\\\\]\\(", start_of_string)) == len(
+                    re.findall(b"[^\\\\]\\)", start_of_string)
                 ):
                     nb_inlines += 1
             self.inline_images_keys = [f"~{x}~" for x in range(nb_inlines)]