diff --git a/ChangeLog b/ChangeLog
index 31a156b..129dc95 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2024-06-17  hwpplayer1  <hwpplayer1@debian>
+
+	* python/Python.pdf: CSD (PSD) shell example written page 133
+
 2024-06-09  Mert Gör  <mertgor@masscollabs.xyz>
 
 	* python/Python.pdf: continue Deyimi sayfa 132
diff --git a/python/add_list_to_set.py b/python/add_list_to_set.py
index d775ecc..fbbe96e 100644
--- a/python/add_list_to_set.py
+++ b/python/add_list_to_set.py
@@ -1,9 +1,3 @@
-"""
-Experimental code written by Mert Gör(hwpplayer1)
-GPLv3-or-later 
-"""
-
 mert = set('mert')
 gor = ['g','o','r']
-mert.update(gor)
-print(mert)
+print(gor,mert)
diff --git a/python/psd-shell.py b/python/psd-shell.py
new file mode 100644
index 0000000..2d48217
--- /dev/null
+++ b/python/psd-shell.py
@@ -0,0 +1,14 @@
+while True:
+    cmd = input('PSD>').strip()
+    if cmd == '':
+        continue
+    if cmd == 'dir':
+        print('dir command')
+    elif cmd == 'del':
+        print('del command')
+    elif cmd == 'copy':
+        print('copy command')
+    elif cmd == 'exit':
+        break
+    else:
+        print('bad command!')