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)
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