first_app.py

# import libs
import streamlit as st
import pandas as pd
import numpy as np


# write title
st.title('my frist app ')

# write text
st.write('i love this ')


# data frame
st.write(pd.DataFrame({
    'first column': [1, 2, 3, 4],
    'second column': [10, 20, 30, 40]
}))

# chart
chart_data = pd.DataFrame(
     np.random.randn(20, 3),
     columns=['a', 'b', 'c'])

st.line_chart(chart_data)

# map
map_data = pd.DataFrame(
    np.random.randn(1000, 2) / [50, 50] + [37.76, -122.4],
    columns=['lat', 'lon'])

st.map(map_data)


# use check box to show or hide data
if st.checkbox('Show dataframe'):
    chart_data = pd.DataFrame(
       np.random.randn(20, 3),
       columns=['a', 'b', 'c'])

    chart_data

# select box

df=pd.DataFrame({
    'first column': [1, 2, 3, 4],
    'second column': [10, 20, 30, 40]
})

option = st.selectbox('Which number do you like best?',df['first column'])

'You selected: ', option


# side bar
st.sidebar.selectbox(
    'Which number do you like best?',
     df['second column'])

# side by side widget
left_column, right_column = st.beta_columns(2)
pressed = left_column.button('Press me?')
if pressed:
    right_column.write("Woohoo!")

expander = st.beta_expander("FAQ")
expander.write("Here you could put in some really, really long explanations...")


#progress
import time
'Starting a long computation...'

# Add a placeholder
latest_iteration = st.empty()
bar = st.progress(0)

for i in range(100):
  # Update the progress bar with each iteration.
  latest_iteration.text(f'Iteration {i+1}')
  bar.progress(i + 1)
  time.sleep(0.1)

'...and now we\'re done!'


#share app
#pip freeze > requirements.txt