Update app.py

app.py

@@ -1,12 +1,12 @@
 import gradio as gr
 import os
-
+import subprocess
 os.system('git clone https://github.com/WongKinYiu/yolov7.git')
 
 
 def detect(inp):
   os.system('python ./yolov7/detect.py --weights ./yolov7/runs/train/yolov7/weights/best.pt --conf 0.25 --img-size 640 --source f{inp} "--project","./yolov7/runs/detect ')
-  return f'{inp}+{os.system('ls ./yolov7/runs/detect/exp')}'
+  return f'{inp}+{subprocess.run(["ls","./yolov7/runs/detect/exp"]) }'
 
 inp = gr.inputs.Image(type="filepath", label="Input")
 output = gr.outputs.Textbox()