将页面文件放到pages目录下，会被自动设备为sidebar

import streamlit as st

add_selectbox = st.sidebar.selectbox(
    "联系方式?",
    ("邮箱", "手机号")
)

# Using "with" notation
with st.sidebar:
    add_radio = st.radio(
        "选择开通方式",
        ("1天体验卡", "连续包月","包年")
    )
    st.button(label="提交")