파이썬 Streamlit 의 cheat sheet - Display Data, Connect to data sources

파이썬 Streamlit 을 위한 cheat sheet가 있다. 항목별로 만들어져 있다. 항목은 "Display text, Display data, Display media, Columns, ..."등이 있다.

cheat sheet 내용을 여기에 옮겨 보았다. 전체 문법을 확인해 볼 수 있는 시간이 될 것이다. 한 섹션 씩 따라 해 보면 도움이 된다.

 

cheat sheet

 

 

참, 아래 처럼 필요한 라이브러리는 import 하여 사용하자.

# _____ Import convention
import streamlit as st
import pandas as pd

 

 

 

 

cheat sheet

 

cheat sheet - Display 

 

Display text

st.text('Fixed width text')
st.markdown('_Markdown_') # see #*
st.caption('Balloons. Hundreds of them...')
st.latex(r''' e^{i\pi} + 1 = 0 ''')
st.write('Most objects') # df, err, func, keras!
st.write(['st', 'is <', 3]) # see *
st.title('My title')
st.header('My header')
st.subheader('My sub')
st.code('for i in range(8): foo()')
# * optional kwarg unsafe_allow_html = True

 

 

Display data

st.dataframe(my_dataframe)
st.table(data.iloc[0:10])
st.json({'foo':'bar','fu':'ba'})
st.metric(label="Temp", value="273 K", delta="1.2 K")

 

Display media

st.image('./header.png')
st.audio(data)
st.video(data)

 

Columns

col1, col2 = st.columns(2)
col1.write('Column 1')
col2.write('Column 2')

# Three columns with different widths
col1, col2, col3 = st.columns([3,1,1])

# col1 is wider
# Using 'with' notation:

with col1:
    st.write('This is column 1')

 

Tabs

# Insert containers separated into tabs:

tab1, tab2 = st.tabs(["Tab 1", "Tab2"])
tab1.write("this is tab 1")
tab2.write("this is tab 2")

# You can also use "with" notation:

with tab1:
    st.radio('Select one:', [1, 2])

 

Control flow

# Stop execution immediately:

st.stop()

# Rerun script immediately:

st.experimental_rerun()

# Group multiple widgets:

with st.form(key='my_form'):
    username = st.text_input('Username')
    password = st.text_input('Password')
    st.form_submit_button('Login')

 

 

 

Personalize apps for users

# Show different content based on the user's email address.

if st.user.email == 'jane@email.com':
    display_jane_content()
elif st.user.email == 'adam@foocorp.io':
    display_adam_content()
else:
    st.write("Please contact us to get access!")

 

Display interactive widgets

st.button('Hit me')
st.data_editor('Edit data', data)
st.checkbox('Check me out')
st.radio('Pick one:', ['nose','ear'])
st.selectbox('Select', [1,2,3])
st.multiselect('Multiselect', [1,2,3])
st.slider('Slide me', min_value=0, max_value=10)
st.select_slider('Slide to select', options=[1,'2'])
st.text_input('Enter some text')
st.number_input('Enter a number')
st.text_area('Area for textual entry')
st.date_input('Date input')
st.time_input('Time entry')
st.file_uploader('File uploader')
st.download_button('On the dl', data)
st.camera_input("一二三,茄子!")
st.color_picker('Pick a color')

# Use widgets' returned values in variables

for i in range(int(st.number_input('Num:'))): foo()
    if st.sidebar.selectbox('I:',['f']) == 'f': b()
    my_slider_val = st.slider('Quinn Mallory', 1, 88)
    st.write(slider_val)

# Disable widgets to remove interactivity:

 st.slider('Pick a number', 0, 100, disabled=True)

 

Build chat-based apps

# Insert a chat message container.

with st.chat_message("user"):
    st.write("Hello 👋")
    st.line_chart(np.random.randn(30, 3))

# Display a chat input widget.

    st.chat_input("Say something")

 

Mutate data

# Add rows to a dataframe after

# showing it.

 element = st.dataframe(df1)
 element.add_rows(df2)


# Add rows to a chart after

# showing it.

 element = st.line_chart(df1)
 element.add_rows(df2)

 

Display code

st.echo()

with st.echo():
    st.write('Code will be executed and printed')

 

Placeholders, help, and options

# Replace any single element.

element = st.empty()
element.line_chart(...)
element.text_input(...)  # Replaces previous.

# Insert out of order.

elements = st.container()
elements.line_chart(...)
st.write("Hello")
elements.text_input(...)  # Appears above "Hello".

st.help(pandas.DataFrame)
st.get_option(key)
st.set_option(key, value)
st.set_page_config(layout='wide')
st.experimental_show(objects)
st.experimental_get_query_params()
st.experimental_set_query_params(**params)

 

cheat sheet - Connect to data sources

 

 

Connect to data sources

st.experimental_connection('pets_db', type='sql')
conn = st.experimental_connection('sql')
conn = st.experimental_connection('snowpark')


class MyConnection(ExperimentalBaseConnection[myconn.MyConnection]):

    def _connect(self, **kwargs) -> MyConnection:
         return myconn.connect(**self._secrets, **kwargs)

    def query(self, query):
        return self._instance.query(query)

 

 

cheat sheet - Optimize performance

 

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Optimize performance

Cache data objects

# E.g. Dataframe computation, storing downloaded data, etc.

@st.cache_data
def foo(bar):
   # Do something expensive and return data
   return data


# Executes foo

d1 = foo(ref1)

# Does not execute foo
# Returns cached item by value, d1 == d2

d2 = foo(ref1)

# Different arg, so function foo executes

d3 = foo(ref2)

# Clear all cached entries for this function

foo.clear()

# Clear values from *all* in-memory or on-disk cached functions

st.cache_data.clear()

 

Cache global resources

# E.g. TensorFlow session, database connection, etc.

@st.cache_resource
def foo(bar):
   # Create and return a non-data object
   return session

# Executes foo

s1 = foo(ref1)

# Does not execute foo
# Returns cached item by reference, s1 == s2

s2 = foo(ref1)

# Different arg, so function foo executes

s3 = foo(ref2)

# Clear all cached entries for this function

foo.clear()

# Clear all global resources from cache

st.cache_resource.clear()

 

 

Deprecated caching

@st.cache
def foo(bar):
  # Do something expensive in here...
  return data

# Executes foo

d1 = foo(ref1)

# Does not execute foo

# Returns cached item by reference, d1 == d2

d2 = foo(ref1)

# Different arg, so function foo executes

d3 = foo(ref2)

 

Display progress and status

# Show a spinner during a process

with st.spinner(text='In progress'):
	time.sleep(3)
	st.success('Done')

# Show and update progress bar

bar = st.progress(50)
time.sleep(3)
bar.progress(100)

st.balloons()
st.snow()
st.toast('Mr Stay-Puft')
st.error('Error message')
st.warning('Warning message')
st.info('Info message')
st.success('Success message')
st.exception(e)