如何为每个列表添加值？
之前：
[['2010', '10', '24', '20', '32', '18', '5'], ['2020', '16', '22', '23', '30', '16', '9'], ['2030', '28', '19', '29', '30', '12', '13']]
结果：[列表]增值''
[['2010', '10', '24', '20', '32', '18', '5', ''], ['2020', '16', '22', '23', '30', '16', '9', ''], ['2030', '28', '19', '29', '30', '12', '13', '']]
用于循环，
nested_list = [['2010', '10', '24', '20', '32', '18', '5'], ['2020', '16', '22', '23', '30', '16', '9'], ['2030', '28', '19', '29', '30', '12', '13']]
for a_list in nested_list:
a_list.append('')
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