python画柱状图并且输出到html文件

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
from Cstring import StringIO

y = [3, 10, 7, 5, 3, 4.5, 6, 8.1]
N = len(y)
x = range(N)
width = 1/1.5
plt.bar(x, y, width, color="blue")

io=StringIO()
plt.savefie(io,format="png")
plt.xticks(rotation=70)
image_tag='<img src="data:image/png;base64,%s"/>'% io.getvalue().encode("base64").strip()

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