dataframe某一列空值统计

要统计DataFrame某一列的空值数量，你可以使用`isnull()`方法将DataFrame转换为一个布尔值的DataFrame，然后使用`sum()`方法得到每一列的空值数量。下面是一个示例代码来统计某一列的空值数量：<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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