diff --git a/Lecture notes/.gitignore b/Lecture notes/.gitignore
new file mode 100644
index 0000000..c4f4e03
--- /dev/null
+++ b/Lecture notes/.gitignore	
@@ -0,0 +1 @@
+handout.pdf 
diff --git a/Lecture notes/build.py b/Lecture notes/build.py
new file mode 100644
index 0000000..20a35a7
--- /dev/null
+++ b/Lecture notes/build.py	
@@ -0,0 +1,8 @@
+import os
+import pathlib
+from glob import glob
+import subprocess
+files = dict(sorted((int(file.name[4:-12]), file) for file in pathlib.Path('.').rglob('week*-handout.pdf')))
+fileList = map(lambda x: f'\"{str(x)}\"', files.values())
+command = f"pdftk {' '.join(fileList)} cat output handout.pdf"
+subprocess.run(command)
\ No newline at end of file