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How to show Matplotlib in Flask?
To show a plot in Flask, we can take the following steps−
- Make a small application.
- To run Flask application, go to the current directory.
- $ export FLASK_APP=file.py
- $ flask run
- Open the browser, hit url:http://127.0.0.1:5000/print-plot/
- To plot the figure, we can create data points for x and y using random.
- Plot data points, x and y, on the created axis.
- Write a figure into png figure format.
- Retrieve the entire contents of the BytesIO object.
Example
import io
from flask import Response
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure
from flask import Flask
import numpy as np
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True
app = Flask(__name__)
@app.route('/print-plot')
def plot_png():
fig = Figure()
axis = fig.add_subplot(1, 1, 1)
xs = np.random.rand(100)
ys = np.random.rand(100)
axis.plot(xs, ys)
output = io.BytesIO()
FigureCanvas(fig).print_png(output)
return Response(output.getvalue(), mimetype='image/png')Output
Updated on: 15-May-2021
6K+ Views
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