dataframe append

DataFrame的append()方法用于将一个或多个DataFrame或Series添加到调用append()的DataFrame中，实现合并的功能。可以通过传入其他DataFrame或Series作为参数来添加到原始DataFrame中。如果需要添加多个DataFrame，则可以使用列表或元组的方式传入。通过append()方法进行合并的结果是按行（纵向）合并的，合并结果的行数是所有DataFrame的行数之和。此外，当使用append方法添加Series时，需要设置name参数作为index的名称。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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