Python Pandas检查数据框是否不为空 [英] Python pandas check if dataframe is not empty

问题描述

我有一个if语句，它在其中检查数据帧是否不为空.我的操作方式如下:

I have an if statement where it checks if the data frame is not empty. The way I do it is the following:

if dataframe.empty:
    pass
else:
    #do something

但是我确实需要:

if dataframe is not empty:
    #do something

我的问题是-是否有方法.not_empty()来实现这一目标?我还想问一下第二个版本在性能方面是否更好?否则，也许我应该保留它的原样，即第一个版本?

My question is - is there a method .not_empty() to achieve this? I also wanted to ask if the second version is better in terms of performance? Otherwise maybe it makes sense for me to leave it as it is i.e. the first version?

推荐答案

只要做

if not dataframe.empty:
     # insert code here

之所以起作用，是因为如果数据帧为空，则dataframe.empty返回True.为了反过来，我们可以使用求反运算符not，它将True翻转为False，反之亦然.

The reason this works is because dataframe.empty returns True if dataframe is empty. To invert this, we can use the negation operator not, which flips True to False and vice-versa.

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