Good afternoon.

I have this question I am trying to solve using "panda" statistical data structures and related syntax from the Python scripting language. I am already graduated from a US university and employed while currently taking the Coursera.org course of "Python for Data Science" just for professional development, which is offered online at Coursera's platform by the University of Michigan. I'm not sharing answers to anyone either as I abide by Coursera's Honor Code.

First, I was given this panda dataframe chart concerning Olympic medals won by countries around the world:

# Summer    Gold    Silver  Bronze  Total   # Winter    Gold.1  Silver.1    Bronze.1    Total.1 # Games Gold.2  Silver.2    Bronze.2    Combined total  ID

Afghanistan 13  0   0   2   2   0   0   0   0   0   13  0   0   2   2   AFG
Algeria 12  5   2   8   15  3   0   0   0   0   15  5   2   8   15  ALG
Argentina   23  18  24  28  70  18  0   0   0   0   41  18  24  28  70  ARG
Armenia 5   1   2   9   12  6   0   0   0   0   11  1   2   9   12  ARM
Australasia 2   3   4   5   12  0   0   0   0   0   2   3   4   5   12  ANZ

Second, the question asked is, "Which country has won the most gold medals in summer games?"

Third, a hint given me as to how to answer using Python's panda syntax is this: "This function should return a single string value."

Fourth, I tried entering this as the answer in Python's panda syntax:

import pandas as pd
    df = pd.read_csv('olympics.csv', index_col=0, skiprows=1)
def answer_one():
    if df.columns[:2]=='00':
        df.rename(columns={col:'Country'+col[4:]}, inplace=True)    
    df_max = df[df[max('Gold')]]
    return df_max['Country']
answer_one() 

Fifth, I have tried other various answers like this in Coursera's auto-grader, but it keeps giving this error message:

Could you please help me solve that question? Any hints/suggestions/comments are welcome for that.

Thanks, Kevin

import pandas as pd
def answer_one():
    df1=pd.Series.max(df['Gold'])
    df1=df[df['Gold']==df1]
    return df1.index[0]

answer_one()