Django中直接输出matplotlib生成的图片方法

from django.shortcuts import render
from django.http import HttpResponse

from matplotlib.figure import Figure      
from matplotlib.backends.backend_agg import FigureCanvasAgg
from matplotlib.dates import DateFormatter
import matplotlib.pyplot as plt

import random
import datetime

# Create your views here.
def gen_mat(request):
 fig=Figure(figsize=(6,6))
 ax=fig.add_subplot(111)
 x=[]
 y=[]
 now=datetime.datetime.now()
 delta=datetime.timedelta(days=1)
 for i in range(10):
  x.append(now)
  now+=delta
  y.append(random.randint(0, 1000))
 ax.plot_date(x, y, '-')
 ax.xaxis.set_major_formatter(DateFormatter('%Y-%m-%d'))
 fig.autofmt_xdate()
 canvas=FigureCanvasAgg(fig)
 response=HttpResponse(content_type='image/png')
 canvas.print_png(response)
 plt.close(fig)
 return response