Python pandas 检查数据框是否为空
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Python pandas check if dataframe is not empty
提问by Arthur Zangiev
I have an ifstatement where it checks if the data frame is not empty. The way I do it is the following:
我有一个if语句，它检查数据框是否为空。我这样做的方式如下：
if dataframe.empty:
pass
else:
#do something
But really I need:
但我真的需要：
if dataframe is not empty:
#do something
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?
我的问题是 - 有没有办法.not_empty()实现这一目标？我也想问第二个版本在性能方面是否更好？否则也许我将它保留为第一个版本是有意义的？
回答by Akshat Mahajan
Just do
做就是了
if not dataframe.empty:
# insert code here
The reason this works is because dataframe.emptyreturns Trueif dataframe is empty. To invert this, we can use the negation operator not, which flips Trueto Falseand vice-versa.
这样做的原因是因为如果数据框为空则dataframe.empty返回True。为了反转这个，我们可以使用否定运算符not，它可以翻转True，False反之亦然。
回答by Santhosh
.empty returns a boolean value
.empty 返回一个布尔值
>>> df_empty.empty
True
So if not empty can be written as
所以如果不为空可以写成
if not df.empty:
#Your code
Check pandas.DataFrame.empty, might help someone.
检查pandas.DataFrame.empty，可能会帮助某人。
回答by Rajarshi Das
You can use the attribute dataframe.emptyto check whether it's empty or not:
您可以使用该属性dataframe.empty来检查它是否为空：
if not dataframe.empty:
#do something
Or
或者
if len(dataframe) != 0:
#do something
Or
或者
if len(dataframe.index) != 0:
#do something
回答by Arjun
Another way:
其它的办法：
if dataframe.empty == False:
#do something`
