python2 与Python 3 的区别（持续更新...）

1.csv 读写

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2017/4/10 0010 下午 10:17
# @Author  : JoJo_feng
# @Theme   :
# @备注    :
import csv

#Python 2 读 CSV文件
reader=csv.reader(file('a.csv', 'rb'))
csvfile = file('9_1_data.csv', 'wb')

#Python 3 读 CSV文件
with open('a.csv','rb') as csvfile:
reader = csv.reader(csvfile)

#Python 2 写 CSV文件
csvfile = file('b.csv', 'wb')
writer1=csv.writer(csvfile)

#Python 3 写 CSV文件
with open('b.csv','wb') as f2:
writer2 = csv.writer(f2)

2. Pickle的安装

#Python 2
import cPickle

#Python 3
import pickle

pickle 读取文件

#Python2
import cPickle
train, test, dicts = cPickle.load(open("./dataset/atis.pkl"))

#Python3

import pickle
train, test, dicts = pickle.load(open("./dataset/atis.pkl", "rb"), encoding='iso-8859-1')

3.xrange与range

xrange( )函数时在python 2.x中的一个函数，在Python 3中，range()的实现方式与xrange()函数相同