diff --git a/Article/PythonBasis/python18/1.md b/Article/PythonBasis/python18/1.md
index af1d7b9a..d78e4fd7 100644
--- a/Article/PythonBasis/python18/1.md
+++ b/Article/PythonBasis/python18/1.md
@@ -96,9 +96,12 @@ print(data_path)
 
 ```python
 from pathlib import Path
+import os
 
-base = Path('/tmp')
-data_path = base / 'demo' / 'sub' / 'foo.txt'
+file_exist = os.path.isfile('foo.txt')
+if file_exist:
+    base = Path('/tmp')
+    data_path = base / 'demo' / 'sub' / 'foo.txt'
 print(data_path)
 ```