如何根据值计数过滤 pandas DataFrame? [英] How do I filter a pandas DataFrame based on value counts?
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问题描述
我正在用Python处理电子游戏的Pandas DataFrame,每个都有一种类型.我正在尝试删除流派少于DataFrame中某些流派的任何视频游戏,但是我不知道如何进行此操作.我确实发现了一个StackOverflow问题,似乎是相关,但是我根本无法破译该解决方案(可能是因为我从未听说过R,并且我对函数式编程的记忆充其量是生锈的).
I'm working in Python with a pandas DataFrame of video games, each with a genre. I'm trying to remove any video game with a genre that appears less than some number of times in the DataFrame, but I have no clue how to go about this. I did find a StackOverflow question that seems to be related, but I can't decipher the solution at all (possibly because I've never heard of R and my memory of functional programming is rusty at best).
帮助?
推荐答案
使用分组过滤器:
In [11]: df = pd.DataFrame([[1, 2], [1, 4], [5, 6]], columns=['A', 'B'])
In [12]: df
Out[12]:
A B
0 1 2
1 1 4
2 5 6
In [13]: df.groupby("A").filter(lambda x: len(x) > 1)
Out[13]:
A B
0 1 2
1 1 4
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