diff --git a/.gitignore b/.gitignore
index 18673cf..9553508 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,58 @@
-*.aux
-*.html
-*.out
-*.gz
-*.tex
-*.toc
-*_files/
-.ipynb_checkpoints/
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+bin/
+build/
+develop-eggs/
+dist/
+eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+.ipynb_checkpoints/
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.cache
+nosetests.xml
+coverage.xml
+
+# Translations
+*.mo
+
+# Mr Developer
+.mr.developer.cfg
+.project
+.pydevproject
+
+# Rope
+.ropeproject
+
+# Django stuff:
+*.log
+*.pot
+
+# Sphinx documentation
+docs/_build/
+
+# back ups
+*.*~
+*.zedstate
diff --git a/clean_book.sh b/clean_book.sh
index a12756c..c0dcd8c 100755
--- a/clean_book.sh
+++ b/clean_book.sh
@@ -1,5 +1,14 @@
 #! /bin/bash
-rm *.tex
-rm *.toc
-rm ./*_files/*.png
-rmdir ./*_files/
+rm --f *.tex
+rm --f *.toc
+rm --f ./*_files/*.png
+rm --f Kalman_and_Bayesian_Filters_in_Python.ipynb
+rm --f Kalman_and_Bayesian_Filters_in_Python.toc
+rm --f Kalman_and_Bayesian_Filters_in_Python.tex
+rmdir  ./*_files/ 2> /dev/null
+
+if (( $# == 1)); then
+  if [ "@1" == all ]; then
+    rm Kalman_and_Bayesian_Filters_in_Python.pdf;
+  fi 
+fi