pip3 install streamlit

import streamlit as st

# 顯示標(biāo)題
st.title("Hello World,I'm echola")

# 顯示文本
st.write("這是一個(gè)由Streamlit搭建的Web平臺(tái)")

 streamlit run hello.py

import time
import streamlit as st

# 全腳本執(zhí)行部分：以下代碼每次交互都會(huì)運(yùn)行
st.title("TimeOut Example")  # ? 標(biāo)題會(huì)重復(fù)渲染，但 Streamlit 會(huì)優(yōu)化為"增量更新"

# 局部增量執(zhí)行：以下代碼僅在按鈕點(diǎn)擊時(shí)觸發(fā)
if st.button("Click me"):
    processing_bar = st.progress(0)  # 每次點(diǎn)擊時(shí)新建進(jìn)度條
    with st.spinner("Loading..."):
        for percent_complete in range(100):
            time.sleep(0.05)
            processing_bar.progress(percent_complete + 1)
    st.success("Loading completed!")

@st.cache_data
def heavy_computation():
    # 此函數(shù)僅在輸入?yún)?shù)或代碼變更時(shí)重新執(zhí)行
    return result

import time
import streamlit as st

st.title("Optimize Example")

# 緩存耗時(shí)操作的結(jié)束（假設(shè)操作是無參數(shù)）
@st.cache_data
def expensive_operation():
    # 模擬耗時(shí)操作（例如：數(shù)據(jù)計(jì)算）
    result = []
    for _ in range(100):
        time.sleep(0.05)  # 假設(shè)這是實(shí)際的計(jì)算步驟
        result.append(_)  # 模擬中間結(jié)果
    return result

if st.button("Click me"):
    processing_bar = st.progress(0)  # 每次點(diǎn)擊時(shí)新建進(jìn)度條
    with st.spinner("Loading..."):
        # 獲取數(shù)據(jù)（首次點(diǎn)擊執(zhí)行耗時(shí)操作，后續(xù)點(diǎn)擊直接讀緩存）
        data = expensive_operation()
        for percent_complete in range(len(data)):
            processing_bar.progress(percent_complete + 1)
    st.success("Loading completed!")

@st.cache_data
def expensive_operation(param1, param2):
    # 根據(jù)參數(shù)執(zhí)行不同計(jì)算
    results = []
    for _ in range(100):
        time.sleep(0.05)
        results.append(param1 + param2 + _)
    return results

# 在按鈕點(diǎn)擊時(shí)傳入?yún)?shù)
data = expensive_operation(10, 20)  # 參數(shù)不同會(huì)生成不同緩存

if "processing_bar" not in st.session_state:
    st.session_state.processing_bar = None  # 初始化進(jìn)度條容器

if st.button("Click me"):
    # 僅在第一次點(diǎn)擊時(shí)創(chuàng)建進(jìn)度條
    if not st.session_state.processing_bar:
        st.session_state.processing_bar = st.progress(0)
    
    # 后續(xù)操作復(fù)用已有進(jìn)度條
    with st.spinner("Loading..."):
        data = expensive_operation()
        for i in range(len(data)):
            st.session_state.processing_bar.progress(i + 1)
    
    # 完成后清空引用
    st.session_state.processing_bar = None
    st.success("Done!")

if "is_processing" not in st.session_state:
    st.session_state.is_processing = False  # 狀態(tài)鎖

if st.button("Click me") and not st.session_state.is_processing:
    st.session_state.is_processing = True  # 鎖定
    try:
        # 執(zhí)行耗時(shí)操作...
    finally:
        st.session_state.is_processing = False  # 釋放

if "load_complete" not in st.session_state:
    st.session_state.load_complete = False

if st.button("Click me"):
    # 執(zhí)行操作...
    st.session_state.load_complete = True

if st.session_state.load_complete:
    st.success("數(shù)據(jù)已加載完成！")
    st.balloons()  # 顯示動(dòng)畫效果

import time
import streamlit as st

st.title("Optimized Example")

# 初始化會(huì)話狀態(tài)
if "processing_bar" not in st.session_state:
    st.session_state.processing_bar = None
if "is_processing" not in st.session_state:
    st.session_state.is_processing = False
if "load_complete" not in st.session_state:
    st.session_state.load_complete = False

@st.cache_data
def expensive_operation():
    result = []
    for _ in range(100):
        time.sleep(0.05)
        result.append(_)
    return result

if st.button("Click me") and not st.session_state.is_processing:
    st.session_state.is_processing = True
    try:
        # 創(chuàng)建或復(fù)用進(jìn)度條
        if not st.session_state.processing_bar:
            st.session_state.processing_bar = st.progress(0)
        
        with st.spinner("Loading..."):
            data = expensive_operation()
            for i in range(len(data)):
                st.session_state.processing_bar.progress(i + 1)
            
            st.session_state.load_complete = True
    finally:
        st.session_state.is_processing = False
        st.session_state.processing_bar = None  # 重置進(jìn)度條

if st.session_state.load_complete:
    st.success("操作成功！")
    st.balloons()