>>603
>>> csv_raw_data = """hoge,1,10,fuga
apple,2,20,pineapple
strawberry,3,30,mango"""
>>>
>>> print(csv_raw_data)
hoge,1,10,fuga
apple,2,20,pineapple
strawberry,3,30,mango
>>>
>>> csv_data = [[int(col) if col.isdigit() else col for col in row.split(',')] for row in csv_raw_data.split('\n')] #数字の文字列はintに変換して2次元リスト化
>>> csv_data
[['hoge', 1, 10, 'fuga'], ['apple', 2, 20, 'pineapple'], ['strawberry', 3, 30, 'mango']]
>>>
>>> [row[1] for row in csv_data] #2列目のデータ抜き出し
[1, 2, 3]
>>>
>>> new_col_1 = [111,112,113] #2列目のNEWデータ
>>> new_csv_data = [[new_col_1[row_idx] if col_idx==1 else col_data for col_idx, col_data in enumerate(row_data)] for row_idx, row_data in enumerate(csv_data)]
>>> new_csv_data
[['hoge', 111, 10, 'fuga'], ['apple', 112, 20, 'pineapple'], ['strawberry', 113, 30, 'mango']]
>>>
>>> new_csv_raw_data = '\n'.join([','.join([str(col) for col in row]) for row in new_csv_data]) #intはstrに変換して文字列化
>>> print(new_csv_raw_data)
hoge,111,10,fuga
apple,112,20,pineapple
strawberry,113,30,mango
>>>