DOC: Black formatting and variable naming

docs/user/extract-text.md

@@ -49,15 +49,19 @@ from PyPDF2 import PdfReader
 reader = PdfReader("GeoBase_NHNC1_Data_Model_UML_EN.pdf")
 page = reader.pages[3]
 
-listParts = []
+parts = []
+
+
 def visitor_body(text, cm, tm, fontDict, fontSize):
  y = tm[5]
  if y > 50 and y < 720:
- listParts.append(text)
+ parts.append(text)
+
+
 page.extract_text(visitor_text=visitor_body)
-textBody = ''.join([t for t in listParts])
+text_body = "".join(parts)
 
-print(textBody)
+print(text_body)
 ```
 
 ### Example 2: Extract rectangles and texts into a SVG-file
@@ -75,15 +79,22 @@ reader = PdfReader("GeoBase_NHNC1_Data_Model_UML_EN.pdf")
 page = reader.pages[2]
 
 dwg = svgwrite.Drawing("GeoBase_test.svg", profile="tiny")
+
+
 def visitor_svg_rect(op, args, cm, tm):
- if op == b're':
- (x, y, w, h) = (args[i].as_numeric() for i in range(4))
- dwg.add(dwg.rect((x, y), (w, h), stroke="red", fill_opacity=0.05))
+ if op == b"re":
+ (x, y, w, h) = (args[i].as_numeric() for i in range(4))
+ dwg.add(dwg.rect((x, y), (w, h), stroke="red", fill_opacity=0.05))
+
+
 def visitor_svg_text(text, cm, tm, fontDict, fontSize):
  (x, y) = (tm[4], tm[5])
  dwg.add(dwg.text(text, insert=(x, y), fill="blue"))
-page.extract_text(visitor_operand_before=visitor_svg_rect,
- visitor_text=visitor_svg_text)
+
+
+page.extract_text(
+ visitor_operand_before=visitor_svg_rect, visitor_text=visitor_svg_text
+)
 dwg.save()
 ```