Update app.py

app.py

@@ -1,4 +1,17 @@
 import streamlit as st
+import os
 
-x = st.slider('Select a value')
-st.write(x, 'squared is', x * x)
+def file_selector(folder_path='.'):
+    filenames = os.listdir(folder_path)
+    selected_filename = st.selectbox('Select a file', filenames)
+    return os.path.join(folder_path, selected_filename)
+
+
+if __name__ == '__main__':
+    # Select a file
+    if st.checkbox('Select a file in current directory'):
+        folder_path = '.'
+        if st.checkbox('Change directory'):
+            folder_path = st.text_input('Enter folder path', '.')
+        filename = file_selector(folder_path=folder_path)
+        st.write('You selected `%s`' % filename)