diff --git a/ufpy/__init__.py b/ufpy/__init__.py
index 324ec5c..f737223 100644
--- a/ufpy/__init__.py
+++ b/ufpy/__init__.py
@@ -1,7 +1,8 @@
-__version__ = '0.1'
+__version__ = '0.1.1'
 
 from .cmp import *
 from .math_op import *
+from .path_tools import *
 from .udict import *
 from .ustack import *
 from .utils import *
diff --git a/ufpy/path_tools.py b/ufpy/path_tools.py
new file mode 100644
index 0000000..d85e839
--- /dev/null
+++ b/ufpy/path_tools.py
@@ -0,0 +1,14 @@
+__all__ = (
+    'number_of_files_with_extensions',
+)
+
+import os
+
+def number_of_files_with_extensions(path, extension) -> int:
+    r = 0
+    for p in os.listdir(path):
+        if os.path.isdir(f'{path}/{p}'):
+            r += number_of_files_with_extensions(f'{path}/{p}', extension)
+        elif p.endswith(f'.{extension}'):
+            r += 1
+    return r
diff --git a/upload.bat b/upload.bat
index f90a080..601b75e 100644
--- a/upload.bat
+++ b/upload.bat
@@ -8,5 +8,3 @@ py -3.12 -m twine upload dist\*
 rd /s /q ufpy.egg-info
 rd /s /q dist
 rd /s /q build
-
-pause
\ No newline at end of file