st.echo - 显示应用源代码

在with块中使用streamlit的echo方法显示应用源代码，然后执行。

方法原型

streamlit.echo()

示例代码

>>> with st.echo():
>>>     st.write('This code will be printed')

下面的示例将中部代码可视化:

import streamlit as st

def get_user_name():
    return 'John'

# ------------------------------------------------
# Want people to see this part of the code...

def get_punctuation():
    return '!!!'

greeting = "Hi there, "
user_name = get_user_name()
punctuation = get_punctuation()

st.write(greeting, user_name, punctuation)

# ...up to here
# ------------------------------------------------

foo = 'bar'
st.write('Done!')

上面的文件创建了一个Streamlit应用，包含词语“Hi there, John”, 以及 “Done!”.

现在让我们使用st.echo()让中间部分的代码可视化：

import streamlit as st

def get_user_name():
    return 'John'

with st.echo():
    # Everything inside this block will be both printed to the screen
    # and executed.

    def get_punctuation():
        return '!!!'

    greeting = "Hi there, "
    value = get_user_name()
    punctuation = get_punctuation()

    st.write(greeting, value, punctuation)

# And now we're back to _not_ printing to the screen
foo = 'bar'
st.write('Done!')

真的很简单！

提示：在一个文件中你可以使用多个st.echo块。