将选定的列数据从数据框中保存到另一个CSV文件中

Question

我正在尝试使用列列表从csv数据框中选择数据列，然后将提取的数据保存到另一个csv_file中。

columns_to_extract = model.columns  # 'Name', 'Age', 'Address', 'Sex' FORM the model database

df = pd.read_csv('some-data.csv', encoding='ISO-8859-1')

df = df[[columns_to_extract]]   # this doesn't work
                                # also tried df = df[[columns_to_extract.split(',)]] and didn't work too

import StringIO

s_df = StringIO.StringIO()
df.to_csv(s_df)