An error in pandas, python . Please give me a hint -


an coursera assignment question . coding follows :

in:

def answer_seven():     pop = census_df[['stname','ctyname','popestimate2015','popestimate2014','popestimate2013','popestimate2012','popestimate2011','popestimate2010']]     pop = pop[pop['stname']!=pop['ctyname']]     index = (pop.max(axis=1)-pop.min(axis=1)).argmax()     return census_df.loc[index]['ctyname']  answer_seven

out:

what's wrong? should index name.


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