[英]deleting rows from data frame based on a condition
I need to delete names of the countries which do not belong to EU from a data frame.我需要从数据框中删除不属于欧盟的国家的名称。 I applied this part of code:
我应用了这部分代码:
df=df[df['COUNTRY'].isin(EU)]
wheras EU is a list of EU countries其中 EU 是欧盟国家的列表
As output I get the df with hidden rows of non EU countries (eg. indexing starts with 6).作为 output 我得到了带有非欧盟国家隐藏行的 df (例如,索引从 6 开始)。 How can I remove them entirely from my dataframe?
如何从我的 dataframe 中完全删除它们?
If indexing is the issue, you could reset the index after slicing your dataframe.如果索引是问题,您可以在切片 dataframe 后重置索引。
Like this:像这样:
df = df[df['COUNTRY'].isin(EU)].reset_index(drop=True)
You can filter out rows with country not in the EU list by using ~
for inversion:您可以使用
~
进行反转来过滤掉国家不在欧盟列表中的行:
df = df[~df['COUNTRY'].isin(EU)]
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