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Get the index of maximum value in DataFrame column

  • Last Updated : 18 Dec, 2018

Pandas DataFrame is two-dimensional size-mutable, potentially heterogeneous tabular data structure with labeled axes (rows and columns).

Let’s see how can we get the index of maximum value in DataFrame column.

Observe this dataset first. We’ll use ‘Weight’ and ‘Salary’ columns of this data in order to get the index of maximum values from a particular column in Pandas DataFrame.




# importing pandas module 
import pandas as pd 
    
# making data frame 
  
df.head(10)

Code #1: Check the index at which maximum weight value is present.






# importing pandas module 
import pandas as pd 
    
# making data frame 
df = pd.read_csv("nba.csv")
  
# Returns index of maximum weight
df[['Weight']].idxmax()

Output:

We can verify whether the maximum value is present in index or not.




   
# importing pandas module 
import pandas as pd 
     
# making data frame 
df = pd.read_csv("nba.csv")
   
# from index 400 to 409
df.iloc[400:410]

Output:

 
Code #2: Let’s insert a new row at index 0, having maximum salary and then varify.




# importing pandas module 
import pandas as pd 
     
# making data frame 
df = pd.read_csv("nba.csv")
  
new_row = pd.DataFrame({'Name':'Geeks', 'Team':'Boston', 'Number':3,
                        'Position':'PG', 'Age':33, 'Height':'6-2',
                        'Weight':189, 'College':'MIT', 'Salary':999999999}
                         , index=[0])
   
df = pd.concat([new_row, df]).reset_index(drop=True)
df.head(5)

Output:

Now, let’s check if the maximum salary is present at index 0 or not.




# Returns index of minimum salary
df[['Salary']].idxmax()

Output:

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