fixed pdf file reader

src/slider/slide.py

@@ -133,7 +133,7 @@ def set_svg_background_images(lecture_tex, verbose=False,
     with open(lecture_tex_nosvg_pdf, 'rb') as f:
         pdfdoc = PyPDF2.PdfReader(f)
         for i in range(len(pdfdoc.pages)):
-            content = pdfdoc.pages[i].extractText()
+            content = pdfdoc.pages[i].extract_text()
             for osvg_name, d in sinfo.items(): #enumerate(sinfo):
 
                 if d['pdf_label'] in content:
@@ -204,7 +204,7 @@ def slide_no_by_text(pdf_file, text):
             print(pdf_file)
             pdfdoc = PyPDF2.PdfReader(f)
             for i in range(len(pdfdoc.pages)):
-                content = pdfdoc.pages[i].extractText()
+                content = pdfdoc.pages[i].extract_text()
                 # for j, d in enumerate(sinfo):
                 if text in content:
                     return i+1