Python Streamlit st.empty用法及代码示例

使用 "with" 符号就地覆盖元素：

import time

with st.empty():
     for seconds in range(60):
         st.write(f"⏳ {seconds} seconds have passed")
         time.sleep(1)
     st.write("✔️ 1 minute over!")

替换几个元素，然后清除它们：

placeholder = st.empty()

# Replace the placeholder with some text:
placeholder.text("Hello")

# Replace the text with a chart:
placeholder.line_chart({"data": [1, 5, 2, 6]})

# Replace the chart with several elements:
with placeholder.container():
     st.write("This is one element")
     st.write("This is another")

# Clear all those elements:
placeholder.empty()