csv文件操作

• 导入csv库

import csv

• 写入csv文件中

with open('a.csv','w+') as csvfile:    writer = csv.writer(csvfile,lineterminator='\n',dialect='excel')    writer.writerow([1,2,3,4])  #注意，即使一列，也要写中括号[ ]    #或者writer.writerows([[1,2],[3,4],[5,6])#注意：lineterminator='\n'的意思是除去多余的空行

This version of the csv module doesn’t support Unicode input. Also, there are currently some issues regarding ASCII NUL characters. Accordingly, all input should be UTF-8 or printable ASCII to be safe

• 读csv文件

 with open('a.csv','r') as csvfile:    reader = csv.reader(csvfile)    for row in reader:        print(row[0])  #打印第一列