First commit

README.md

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+# Welcome to Streamlit!
+
+Edit `/streamlit_app.py` to customize this app to your heart's desire :heart:
+
+If you have any questions, checkout out our [documentation](https://docs.streamlit.io) and
+[community forums](https://discuss.streamlit.io).

requirements.txt

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+altair
+pandas
+streamlit

streamlit_app.py

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+from collections import namedtuple
+import altair as alt
+import math
+import pandas as pd
+import streamlit as st
+
+"""
+# Welcome to Streamlit!
+
+Edit `/streamlit_app.py` to customize this app to your heart's desire :heart:
+
+If you have any questions, checkout out our [documentation](https://docs.streamlit.io) and
+[community forums](https://discuss.streamlit.io).
+
+In the meantime, below is an example of what you can do with just a few lines of code:
+"""
+
+
+with st.echo(code_location='below'):
+    total_points = st.slider("Number of points in spiral", 1, 5000, 2000)
+    num_turns = st.slider("Number of turns in spiral", 1, 100, 9)
+
+    Point = namedtuple('Point', 'x y')
+    data = []
+
+    points_per_turn = total_points / num_turns
+
+    for curr_point_num in range(total_points):
+        curr_turn, i = divmod(curr_point_num, points_per_turn)
+        angle = (curr_turn + 1) * 2 * math.pi * i / points_per_turn
+        radius = curr_point_num / total_points
+        x = radius * math.cos(angle)
+        y = radius * math.sin(angle)
+        data.append(Point(x, y))
+
+    st.altair_chart(alt.Chart(pd.DataFrame(data), height=500, width=500)
+        .mark_circle(color='#0068c9', opacity=0.5)
+        .encode(x='x:Q', y='y:Q'))