查看DataFrame中是否存在值

问题描述

在Python中检查值是否在列表中，您只需执行以下操作即可:

In Python to check if a value is in a list you can simply do the following:

>>>9 in [1,2,3,6,9]
True

我想对Pandas DataFrame做同样的事情，但是不幸的是Pandas无法识别这种符号:

I would like to do the same for a Pandas DataFrame but unfortunately Pandas does not recognise that notation:

>>>import pandas as pd
>>>df = pd.DataFrame([[1,2,3,4],[5,6,7,8]],columns=["a","b","c","d"])
   a  b  c  d
0  1  2  3  4
1  5  6  7  8
>>>7 in df
False

我如何使用Pandas DataFrame来实现此目的而又不遍历每列/每行或任何复杂的事物?

How would I achieve this using Pandas DataFrame without iterating through each column/row or anything complicated?

推荐答案

基本上，您必须检查没有模式的矩阵，因此:

Basically you have to check the matrix without the schema, so:

 7 in df.values

x in df检查x是否在列中:

for x in df:
    print x,

out: a b c d

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