Pandas DataFrame 的 size 属性
定义和用法
size 属性返回 DataFrame 中元素的数量。
元素的数量是行数 * 列数。
在我们的示例中，DataFrame 有 169 行和 4 列：169 * 4 = 676
语法
dataframe.size
返回值
一个整数，表示 DataFrame 中元素的数量。
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