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python Csv with opEn

with open(r"C:\Users\*******\Desktop\pokemon.csv") as f:少了个r

reader = csv.reader(open('E:/BigData/tianchi_mobile_recommend_train_user.csv','r+')) \t是制表符,直接用/代表\避免 出现 "\t" "\n"这样的转 义符

这两天刚好看到,Python CookBook上有说到。这里是三种读取csv的方法。 文件格式是这样的 Region,DATE_,RAW_ACU zh_ch,Jan 27 2017,208172 import csvfrom collections import namedtuple# with open('data.csv') as f:# f_csv = csv.reader(f)#...

input = {}with open('tst1.csv') as f: for line in f: key, field1, field2, field3 = line[:-1].split(',') input[key] = (key, field1, field2, field3) with open('tst2.csv') as fr, open('output.csv', w) as fw: for line in fr: key, f...

这个跟你打开文件的方式有关,官方教程例子: import csvwith open('eggs.csv', 'wb') as csvfile: spamwriter = csv.writer(csvfile, delimiter=' ', quotechar='|', quoting=csv.QUOTE_MINIMAL) spamwriter.writerow(['Spam'] * 5 + ['Baked B...

import csvwith open('test.csv') as csvfile: rows = csv.reader(csvfile) with open('test1.csv','w', newline='') as f: writer = csv.writer(f) for row in rows: row.append(row[len(row)-1]) writer.writerow(row)这是一个把最后一列重复...

import csvwith open('eggs.csv', newline='') as csvfile: spamreader = csv.reader(csvfile, delimiter=',', quotechar=',') for row in spamreader: print(', '.join(row))

什么是CSV 就是内容用逗号隔开,后缀是‘.csv’的文件。它可以被任何一个文本编辑器打开。如果用excel打开,它又可以是这样的: END 读CSV 典型的可处理的csv文件,通常含有表头,也就是每列的列名。这样一来,每一行的内容就可以被当作是以表头为...

这两天刚好看到,Python CookBook上有说到。这里是三种读取csv的方法。 文件格式是这样的 Region,DATE_,RAW_ACU zh_ch,Jan 27 2017,208172 import csvfrom collections import namedtuple # with open('data.csv') as f:# f_csv = csv.reader(f)...

因为python处理json比较方便,所以首先测试一下csv和json哪个快。 首先生成测试数据 # coding: utf-8 import json import csv import random from string import letters low = 1e2 # 3-10位数字 hi = 1e11 cnt = 100000 # 10万条 total = {} fo...

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