python学习-文件读写整理

#1.open 读文本文件，open需与close（）配对使用

#coding=utf-8
# r 可省略，默认为r  

source = open("D:\pythonTest\data\data01.txt","r")

try:
    values = source.read()
    print values
finally:
    source.close()

#一行行地读文本

source = open("D:\pythonTest\data\data01.txt")
lines =source.readlines()
#通过遍历每行
for line in lines:
    print line

source.close()

#2. 打开csv文件

csv.reader（）

import csv

def loginData():
    my_file = "D:\\pythonTest\\data\loginData.csv"
    datas = csv.reader(file(my_file,'rb'))
   
     return datas

'''
    for data in datas:
        openUrl = data[0]
        username = data[1]
        password = data[2]

    return data
'''
    

#3.打开 csv 方法： with open('xxx.csv','rb') as f:

#读取csv文件，文档有表头
with open('D:\pythonTest\data\loginData02.csv','rb') as csvfile:
        reader = csv.DictReader(csvfile)
        urls = []
        usernames = []
        passwords= []
        for row in reader:
　　　　　　　　#需知道列名
            if row['if_excute'] != 'if_excute':
                url = row['url']
                username = row['username']
                password = row['password']
                urls.append(url)
                usernames.append(username)
                passwords.append(password)

        print urls
        print passwords
        print usernames