Checking if an element belongs in a dataframe row

[palladium]

I'm trying to search if a dataframe contains a specified number for each row. The problem is: A user enters an audiogram, which is converted to a Dataframe in my code. I need to find if the highest number in each ear (row) is contained in a subset of the audiogram. The code is:

The audiogram:

Output:
                500Hz  1000Hz  1500Hz  2000Hz  3000Hz  4000Hz  6000Hz  8000Hz
Right Ear     10      15      15      20      20      15      15      0
Left Ear      15      40      45      50      55      44      60      80

I want to know if the highest number in each ear (which is 20 on the right and 80 on the left) exists in the columns 3000Hz to 6000Hz inclusive. Should be True for right and False for left.

My code:

import pandas as pd
audio = pd.DataFrame([[10,15,15,20,20,15,15,0],[15,40,45,50,55,44,60,80]], index = ['Right Ear', 'Left Ear'], 
     columns = ['500Hz','1000Hz','1500Hz','2000Hz','3000Hz','4000Hz','6000Hz','8000Hz'])   #generates audiogram above
exclusion = ['500Hz','1000Hz','1500Hz','2000Hz','8000Hz']

df = audio.drop(labels = [i for i in exclusion], axis = 1) #gets rid of the columns in the exclusion list
df2 = pd.DataFrame(data = audio.max(axis = 1), columns = ['maximum']) #gets max values

for ear in df2.index:
    df2['present in df'] = True if (df.loc[(ear),:].isin(df2).any()) else False   #This is the line I am having trouble with

print(df)
print(df2)

When the code runs, I get:

Output:
           3000Hz  4000Hz  6000Hz    #this is the result of print(df), the truncated dataframe from the original audiogram
Right Ear      20      15      15
Left Ear       55      44      60

           maximum  present in df
Right Ear       20             False  #This should be True!
Left Ear        80             False  # This is correct

...which is not what I expected

Would appreciate some pointers.

Thanks in advance.