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python 循环写入Csv

我改了一下你的代码,实测是可以从 a.csv复制到 b.csv中 import csv def foo(): with open('a.csv', 'r') as f: reader = csv.DictReader(f) rows = [row for row in reader] if not rows: return with open('b.csv', mode='w', newline='', err...

# -*- coding: utf8 -*-import csvl = [['1', 'Wonderful Spam'],['2', 'Lovely Spam']]#模拟数据写入一个csvwith open('eggs.csv', 'w', newline='') as csvfile: spamwriter = csv.writer(csvfile, delimiter=',', quotechar='"', quoting=csv...

最常用的一种方法,利用pandas包 import pandas as pd#任意的多组列表a = [1,2,3]b = [4,5,6] #字典中的key值即为csv中列名dataframe = pd.DataFrame({'a_name':a,'b_name':b})#将DataFrame存储为csv,index表示是否显示行名,default=Truedatafr...

每行切词完后,一行放入一个list.多行就是多个list,每个list中的item,就是切词后的词。 输出的时候,直接 for x in y: ','.join(x)就ok了

代码如下: import requests from bs4 import BeautifulSoup import csv def GetInfo(url): res=requests.get(url).text soup=BeautifulSoup(res,'html.parser') names=soup.select('div.list > ul > li > div > p.infoBox > a') years=soup.sel...

用pandas库可以实现: import pandas as pdfile = 'your_csv_path.csv'data = pd.read_csv(file)data['sort'] = data['gender'].map(lambda x: 1 if x == 'man' else -1)data.to_csv(file, index=False)

import csvcsvfile = file('csvtest.csv', 'wb')writer = csv.writer(csvfile)writer.writerow(['id', 'url', 'keywords'])data = [ ('1', 'http://www.xiaoheiseo.com/', '小黑'), ('2', 'http://www.baidu.com/', '百度'), ('3', 'http://www....

参考方法如下: 逐行处理: for line in open("samples/sample.csv"): title, year, director = line.split(",") //以“,”号为分割,按逗号将数据分成三部分; print year, title 使用csv模块处理: import csv reader = csv.reader(open("sample...

for line in open(r'C:/Users/Test.csv') : 试下

代码如下: import requests from bs4 import BeautifulSoup import csv def GetInfo(url): res=requests.get(url).text soup=BeautifulSoup(res,'html.parser') names=soup.select('div.list > ul > li > div

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