'set' object has no attribute 'append'

"'set' object has no attribute 'append'" 是一个错误信息，它表示在一个set对象上调用了append()方法，而set对象是不支持append()方法的。解决这个问题的方法是使用add()方法来向set对象中添加元素，而不是使用append()方法。 另外，还可以将set对象初始化为一个空列表[]而不是一个set集合{}，这样就可以使用append()方法来添加元素。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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