请记住打电话，
buf.seek(0)所以
Image.open(buf)从：的开头开始阅读
buf：
import iofrom PIL import Imageimport matplotlib.pyplot as pltplt.figure()plt.plot([1, 2])plt.title("test")buf = io.BytesIO()plt.savefig(buf, format='png')buf.seek(0)im = Image.open(buf)im.show()buf.close()
