Create new file

app.py

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+import streamlit as st
+import time
+
+st.set_page_config()
+
+ph = st.empty()
+N = 5*60
+for secs in range(N,0,-1):
+    mm, ss = secs//60, secs%60
+    ph.metric("Countdown", f"{mm:02d}:{ss:02d}")
+    time.sleep(1)