diff --git a/dedoc/data_structures/line_with_meta.py b/dedoc/data_structures/line_with_meta.py
index 60040b25..4642c8ff 100644
--- a/dedoc/data_structures/line_with_meta.py
+++ b/dedoc/data_structures/line_with_meta.py
@@ -184,8 +184,8 @@ def to_api_schema(self) -> ApiLineWithMeta:
     def shift(self, shift_x: int, shift_y: int, image_width: int, image_height: int) -> None:
         import json
         from dedoc.data_structures.concrete_annotations.bbox_annotation import BBoxAnnotation
-        for i_ann, annotation in enumerate(self.annotations):
+        for annotation in self.annotations:
             if annotation.name == "bounding box":
                 bbox, page_width, page_height = BBoxAnnotation.get_bbox_from_value(annotation.value)
                 bbox.shift(shift_x, shift_y)
-                self.annotations[i_ann].value = json.dumps(bbox.to_relative_dict(image_width, image_height))
+                annotation.value = json.dumps(bbox.to_relative_dict(image_width, image_height))
diff --git a/dedoc/readers/pdf_reader/data_classes/tables/cell.py b/dedoc/readers/pdf_reader/data_classes/tables/cell.py
index c57ad29c..dd7ece41 100644
--- a/dedoc/readers/pdf_reader/data_classes/tables/cell.py
+++ b/dedoc/readers/pdf_reader/data_classes/tables/cell.py
@@ -31,9 +31,9 @@ def copy_from(cell: "Cell",
                     contour_coord=cell.con_coord)
 
     def shift(self, shift_x: int, shift_y: int, image_width: int, image_height: int) -> None:
-        if self.lines and len(self.lines) >= 1:
-            for i_lin, _line in enumerate(self.lines):
-                self.lines[i_lin].shift(shift_x=shift_x, shift_y=shift_y, image_width=image_width, image_height=image_height)
+        if self.lines:
+            for line in self.lines:
+                line.shift(shift_x=shift_x, shift_y=shift_y, image_width=image_width, image_height=image_height)
         self.x_top_left += shift_x
         self.x_bottom_right += shift_x
         self.y_top_left += shift_y
diff --git a/dedoc/readers/pdf_reader/pdf_base_reader.py b/dedoc/readers/pdf_reader/pdf_base_reader.py
index ed50dc6f..81b51b0b 100644
--- a/dedoc/readers/pdf_reader/pdf_base_reader.py
+++ b/dedoc/readers/pdf_reader/pdf_base_reader.py
@@ -161,36 +161,36 @@ def _shift_all_contents(self, lines: List[LineWithMeta], mp_tables: List[ScanTab
                             gost_analyzed_images: List[Tuple[np.ndarray, BBox]]) -> None:
         # shift mp_tables
         for scan_table in mp_tables:
-            for i_loc, location in enumerate(scan_table.locations):
+            for location in scan_table.locations:
                 table_page_number = location.page_number
-                scan_table.locations[i_loc].shift(shift_x=gost_analyzed_images[table_page_number][1].x_top_left,
-                                                  shift_y=gost_analyzed_images[table_page_number][1].y_top_left)
+                location.shift(shift_x=gost_analyzed_images[table_page_number][1].x_top_left,
+                               shift_y=gost_analyzed_images[table_page_number][1].y_top_left)
             for row in scan_table.matrix_cells:
                 row_page_number = scan_table.page_number
                 for cell in row:  # check page number information in the current table row, because table can be located on multiple pages
                     if cell.lines and len(cell.lines) >= 1:
                         row_page_number = cell.lines[0].metadata.page_id
                         break
-                for i_cel, cell in enumerate(row):  # if cell doesn't contain page number information we use row_page_number
+                for cell in row:  # if cell doesn't contain page number information we use row_page_number
                     page_number = cell.lines[0].metadata.page_id if cell.lines and len(cell.lines) >= 1 else row_page_number
                     image_width, image_height = gost_analyzed_images[page_number][0].shape[1], gost_analyzed_images[page_number][0].shape[0]
                     shift_x, shift_y = gost_analyzed_images[page_number][1].x_top_left, gost_analyzed_images[page_number][1].y_top_left
-                    row[i_cel].shift(shift_x=shift_x, shift_y=shift_y, image_width=image_width, image_height=image_height)
+                    cell.shift(shift_x=shift_x, shift_y=shift_y, image_width=image_width, image_height=image_height)
 
         # shift attachments
-        for i_att, attachment in enumerate(attachments):
+        for attachment in attachments:
             attachment_page_number = attachment.location.page_number
             shift_x, shift_y = gost_analyzed_images[attachment_page_number][1].x_top_left, gost_analyzed_images[attachment_page_number][1].y_top_left
-            attachments[i_att].location.shift(shift_x, shift_y)
+            attachment.location.shift(shift_x, shift_y)
 
         # shift lines
-        for i_lin, line in enumerate(lines):
+        for line in lines:
             page_number = line.metadata.page_id
             image_width, image_height = gost_analyzed_images[page_number][0].shape[1], gost_analyzed_images[page_number][0].shape[0]
-            lines[i_lin].shift(shift_x=gost_analyzed_images[page_number][1].x_top_left,
-                               shift_y=gost_analyzed_images[page_number][1].y_top_left,
-                               image_width=image_width,
-                               image_height=image_height)
+            line.shift(shift_x=gost_analyzed_images[page_number][1].x_top_left,
+                       shift_y=gost_analyzed_images[page_number][1].y_top_left,
+                       image_width=image_width,
+                       image_height=image_height)
 
     @abstractmethod
     def _process_one_page(self, image: ndarray, parameters: ParametersForParseDoc, page_number: int, path: str) \