main.py

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

st.title('Uber pickups in NYC -- updated')

DATE_COLUMN = 'date/time'
DATA_URL = ('https://s3-us-west-2.amazonaws.com/'
         'streamlit-demo-data/uber-raw-data-sep14.csv.gz')

def load_data(nrows):
    data = pd.read_csv(DATA_URL, nrows=nrows)
    lowercase = lambda x: str(x).lower()
    data.rename(lowercase, axis='columns', inplace=True)
    data[DATE_COLUMN] = pd.to_datetime(data[DATE_COLUMN])
    return data

# Create a text element and let the reader know the data is loading.
data_load_state = st.text('Loading data...')
# Load 10,000 rows of data into the dataframe.
with st.spinner('Wait for it...'):
    data = load_data(10000)
# Notify the reader that the data was successfully loaded.
data_load_state.text('Loading data...done!')

st.subheader('Raw data')
st.write(data)
###################################################
st.subheader('Number of pickups by hour')

hist_values = np.histogram(
    data[DATE_COLUMN].dt.hour, bins=24, range=(0,24))[0]

st.bar_chart(hist_values)

###################################################
st.subheader('Map of all pickups')
st.map(data)

# if st.button('Click here'):
#     st.write('Why hello there')
# else:
#     st.write('Goodbye')