diff --git a/pdf/to_pdf.py b/pdf/to_pdf.py
index dc74efc..c235790 100644
--- a/pdf/to_pdf.py
+++ b/pdf/to_pdf.py
@@ -1,26 +1,15 @@
-from __future__ import print_function
-import io
-
-import IPython.nbconvert.exporters.pdf as pdf
-import fileinput
-
-'''
-for line in fileinput.input('book.tex', openhook=fileinput.hook_encoded("iso-8859-1")):
-    #print(line.replace('\chapter{Preface}\label{preface}', '\chapter*{Preface}\label{preface}'), end='')
-#    line.replace('    \chapter{Preface}\label{preface}', '    \chapter*{Preface}\label{preface}')
-    line.replace('shit', 'poop')
-'''
-
-f = open('book.tex', 'r',  encoding="iso-8859-1")
-filedata = f.read()
-f.close()
-
-newdata = filedata.replace('\chapter{Preface}', '\chapter*{Preface}')
-
-f = open('book.tex', 'w',  encoding="iso-8859-1")
-f.write(newdata)
-f.close()
-
-p = pdf.PDFExporter()
-p.run_latex('book.tex')
-
+import IPython.nbconvert.exporters.pdf as pdf
+
+f = open('book.tex', 'r',  encoding="iso-8859-1")
+filedata = f.read()
+f.close()
+
+newdata = filedata.replace('\chapter{Preface}', '\chapter*{Preface}')
+
+f = open('book.tex', 'w', encoding="iso-8859-1")
+f.write(newdata)
+f.close()
+
+p = pdf.PDFExporter()
+p.run_latex('book.tex')
+