NameError: name 'Counter' is not defined

这个错误是因为在代码中使用了Counter这个名字，但是没有正确导入相关模块。解决这个问题的方法是使用`from collections import Counter`语句来导入Counter模块。 Counter是一个用于计数的工具，常用于统计元素出现的次数。如果没有正确导入Counter模块，Python就无法识别这个名字，从而引发NameError错误。

请确保在使用Counter之前，已经添加了`from collections import Counter`语句。这样就能够正确调用Counter模块中的功能，避免NameError错误的发生。<span class="em">1</span><span class="em">2</span>
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