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 csv2 #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)
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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"])
