Python报错之：AttributeError: 'NoneType' object has no attribute 'seq'

在用matplotlib进行数据可视化、给图形添加标签数据标签时遇到一个报错：AttributeError: 'NoneType' object has no attribute 'seq'.数组 记录一下，代码：spa from pylab import * import matplotlib.pyplot as plt a = ['a','b','c','d'] b = ['1','2','3

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