如何保存python程序所生产的数据？

import requests

from lxml import etree

#发送Request请求

url = 'https://book.douban.com/subject/1054917/comments/'

head = {'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36'}

#解析HTML

r = requests.get(url, headers=head)

s = etree.HTML(r.text)

comments = s.xpath('//div[@class="comment"]/p/text()')

#print(str(comments))#在写代码的时候可以将读取的内容打印一下

#保存数据open函数

with open('D:/PythonWorkSpace/TestData/pinglun.txt','w',encoding='utf-8') as f:#使用with open()新建对象f

    for i in comments:

        print(i)

        f.write(i+'\n')#写入数据，文件保存在上面指定的目录，加\n为了换行更方便阅读

#导入包import pandas as pd

import numpy as np

df = pd.DataFrame(np.random.randn(10,4))#创建随机值

#print(df.head(2))#查看数据框的头部数据，默认不写为前5行，小于5行时全部显示；也可以自定义查看几行

print(df.tail())##查看数据框的尾部数据，默认不写为倒数5行，小于5行时全部显示；也可以自定义查看倒数几行

df.to_csv('D:/PythonWorkSpace/TestData/PandasNumpy.csv')#存储到CSV中

#df.to_excel('D:/PythonWorkSpace/TestData/PandasNumpy.xlsx')#存储到Excel中(需要提前导入库 pip install openpyxl)

import requests

from lxml import etree

#发送Request请求

url = 'https://book.douban.com/subject/1054917/comments/'

head = {'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36'}

#解析HTML

r = requests.get(url, headers=head)

s = etree.HTML(r.text)

comments = s.xpath('//div[@class="comment"]/p/text()')

#print(str(comments))#在写代码的时候可以将读取的内容打印一下

'''

#保存数据open函数

with open('D:/PythonWorkSpace/TestData/pinglun.txt','w',encoding='utf-8') as f:#使用with open()新建对象f

    for i in comments:

        print(i)

        f.write(i+'\n')#写入数据，文件保存在上面指定的目录，加\n为了换行更方便阅读

'''

#保存数据pandas函数   到CSV 和Excel

import pandas as pd

df = pd.DataFrame(comments)

#print(df.head())#head()默认为前5行

df.to_csv('D:/PythonWorkSpace/TestData/PandasNumpyCSV.csv')

#df.to_excel('D:/PythonWorkSpace/TestData/PandasNumpyEx.xlsx')