AttributeError: 'NoneType' object has no attribute 'Context'

AttributeError: 'NoneType' object has no attribute 'Context'错误是因为在代码中尝试访问了一个NoneType对象的属性Context，而NoneType对象没有这个属性。根据第一引用，Nonetype类型只有一个None，它没有任何内建方法和属性。根据第二引用，当某个变量变为None时，会出现这个错误。所以，问题的原因是在代码中的某个地方，变量Context被赋值为了None。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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