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app.py
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app.py
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from io import BytesIO
import random
import numpy as np
import seaborn as sns
from flask import Flask, send_file
import matplotlib
matplotlib.use('agg')
import matplotlib.pyplot as plt
# styling. enable only one.
plt.style.use('seaborn')
# plt.style.use('fivethirtyeight')
# plt.xkcd()
app = Flask(__name__)
@app.route('/')
def frontpage():
return """
<!doctype html>
<head><title>dynamic</title></head>
<body>
<div>
<img style="border: 1px dotted red" src="/example1.png" />
</div>
<div>
<img style="border: 1px dotted red" src="/example2.png" />
</div>
</body>
</html>
"""
@app.route('/example1.png')
def example1():
fig, ax = plt.subplots()
draw1(ax)
return nocache(fig_response(fig))
def draw1(ax):
"""Draw a random scatterplot"""
x = [random.random() for i in range(100)]
y = [random.random() for i in range(100)]
ax.scatter(x, y)
ax.set_title("Random scatterplot")
@app.route('/example2.png')
def example2():
"""Draw a hexbin with marginals
From https://seaborn.pydata.org/examples/hexbin_marginals.html
"""
sns.set(style='ticks')
rs = np.random.RandomState(11)
x = rs.gamma(2, size=1000)
y = -.5 * x + rs.normal(size=1000)
plot = sns.jointplot(x, y, kind='hex', color='#4CB391')
fig = plot.fig
return nocache(fig_response(fig))
def fig_response(fig):
"""Turn a matplotlib Figure into Flask response"""
img_bytes = BytesIO()
fig.savefig(img_bytes)
img_bytes.seek(0)
return send_file(img_bytes, mimetype='image/png')
def nocache(response):
"""Add Cache-Control headers to disable caching a response"""
response.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate, max-age=0'
return response