Perl, Ruby, JS, When you want to handle pandas with the feeling of a free dictionary structure, There is no key (index) by all means! I think it will be a problem.
First,
AAA["hoge"].iloc[n] = "hogehoge"
It starts with throwing away such ideas.
#First, prepare df only for column
df = pd.DataFrame( columns=['A','B'] )
#Make a line
tmp_se = pd.Series( [ i, i*i ], index=list_df.columns )
#Add line as record to df
df = df.append( tmp_se, ignore_index=True )
I referred to the following. https://qiita.com/567000/items/d8a29bb7404f68d90dd4
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