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问题：
ValueError: DateFormatter found a value of x=0, which is an illegal date. This usually occurs because you have not informed the axis that it is plotting dates, e.g., with ax.xaxis_date()
解决办法：
首先，需要将时间格式转换为字符串str(h)
其次，需要将字符串转换为可以识别的时间格式datetime.datetime.strptime(str(h), '%Y-%m-%d %H:%M:%S')
最后，画图的时候横坐标的时间标签代码设置plt.gca().xaxis.set_major_formatter(mdate.DateFormatter('%Y-%m-%d %H:%M:%S'))
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