我对Flask和Matplotlib很陌生。我希望能够用一些html格式显示我生成的简单图表,但我很难弄清楚怎么做。以下是我的Python代码:
from flask import Flask, render_template
import numpy as np
import pandas
import matplotlib.pyplot as plt
app = Flask(__name__)
variables = pandas.read_csv('C:\\path\\to\\variable.csv')
price =variables['price']
@app.route('/test')
def chartTest():
lnprice=np.log(price)
plt.plot(lnprice)
return render_template('untitled1.html', name = plt.show())
if __name__ == '__main__':
app.run(debug = True)
下面是我的HTML:
<!doctype html>
<html>
<body>
<h1>Price Chart</h1>
<p>{{ name }}</p>
<img src={{ name }} alt="Chart" height="42" width="42">
</body>
</html>
发布于 2018-06-07 04:22:07
您可以在Flask URL路由处理程序中动态生成图像:
import io
import random
from flask import Response
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure
@app.route('/plot.png')
def plot_png():
fig = create_figure()
output = io.BytesIO()
FigureCanvas(fig).print_png(output)
return Response(output.getvalue(), mimetype='image/png')
def create_figure():
fig = Figure()
axis = fig.add_subplot(1, 1, 1)
xs = range(100)
ys = [random.randint(1, 50) for x in xs]
axis.plot(xs, ys)
return fig
然后,您需要在HTML模板中包含图像:
<img src="/plot.png" alt="my plot">
发布于 2018-06-07 04:14:24
正如@d parolin指出的那样,由matplotlib
生成的图形在被HTML呈现之前需要保存。为了通过超文本标记语言在flask
中提供图像,您需要将图像存储在flask
文件目录中:
static/
images/
plot.png --> store plots here
templates/
因此,在您的应用程序中应使用plt.savefig
@app.route('/test')
def chartTest():
lnprice=np.log(price)
plt.plot(lnprice)
plt.savefig('/static/images/new_plot.png')
return render_template('untitled1.html', name = 'new_plot', url ='/static/images/new_plot.png')
然后在untitled1.html
中
<p>{{ name }}</p>
<img src={{ url}} alt="Chart" height="42" width="42">
https://stackoverflow.com/questions/50728328
复制相似问题