读取csv文件一、创建一个csv文件['city', 'password', 'day'] ['1', '1', '1']
['2', '1', '1']
['3', '1', '1']
['4', '1', '1']
['5', '1', '1']
二、读取csv文件import csv #打开一个csv文件，模式为读取
csvfile = open('/Users/yanghui/Study/python/example.csv','r')
#定义一个变量，进行读取
readCSV = csv.reader(csvfile)
print(readCSV)
#分行打印for row in readCSV:
print(row) #读取第一行第二个元素readCSV = csv.reader(csvfile)
rows = [row for row in readCSV]
print(rows[0][1]) #获取第一行第二个元素readCSV = csv.reader(csvfile)
for i,rows in enumerate(readCSV):
if i == 0:
row = rows
print(rows[1]) #每列输出打印readCSV = csv.reader(csvfile)
list1 = []
list2 = []
list3 = []
for row in readCSV:
list1.append(row[0])
list2.append(row[1])
list3.append(row[2])
print(list1)
print(list2)
print(list3)
1 import csv
2 #打开文件，用with打开可以不用去特意关闭file了，python3不支持file()打开文件，只能用open()
3 with open("XXX.csv","r",encoding="utf-8") as csvfile:
4 #读取csv文件，返回的是迭代类型
5 read = csv.reader(csvfile)
6 for i in read:
7 print(i)———————————————————————————————————————————————————————— 写入csv文件 import csv
#打开一个csv文件，模式为写，如果没有该文件，则创建一个
with open('/Users/yanghui/Study/python/test.csv','a') as csvfile:
#定义一个写变量
writeCSV = csv.writer(csvfile)
writeCSV.writerow(['index','yanghui','18'])
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