python学习

文件操作

1.判断文件/创建/删除等操作

import os
#可使用此方法判断文件or目录是否存在
os.path.exists(filepath)
os.path.isfile()
os.path.isdir()
#多级的话，只创建最后一级，若上级不存在，抛异常
os.makedir()
#递归创建
os.makedirs()
#删除文件
os.remove()

2.读/写文件1

input = open('data', 'r')
#读所有内容
text = input.read()
#读每行
list_of_all_the_lines = input.readlines()
for line in file_object:
    process line

#写文件-英文
f = file('a.txt', 'w')
f.write('eng')
f.colse()

#写文件-中文-UTF8
import codecs
f = codecs.open("b.txt", "w", "utf-8")
f.write('中文')
f.close()

3.生成文件md52

import hashlib

fileobject = open(filename,"r")  
fText = fd.read()  
fileobject.close()           
fmd5 = hashlib.md5(fText)
md5 = fmd5.hexdigest()  

4.获取当前脚本文件路径3

import sys
path = sys.path[0]

python操作redis4

import redis
r = redis.StrictRedis(host='127.0.0.1', port=6379)
r.set('key', 'val')
res = r.get('key')

python下载文件5

import urllib
urlretrieve(url, [filename=None, [reporthook=None, [data=None]]])

python json处理

import json
data = [{'a':"1",'b':(0,1),'c':3.0}]
str = json.dumps(data)

data = json.loads(str)

python bsdiff4

首先安装模块bsdiff4

import bsdiff4

fileObjectA = open(sourceFilePath, 'r')
textA = fileObjectA.read()
fileObjectA.close()

fileObjectB = open(fileBPath, 'r')
textB = fileObjectB.read()
fileObjectB.close()
#生成patch
patch = bsdiff4.diff(textA, textB)
#根据patch生成新文件
newFile = bsdiff4.patch(textA, patch)

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1. http://www.cnblogs.com/allenblogs/archive/2010/09/13/1824842.html ↩
2. http://blog.youkuaiyun.com/linda1000/article/details/17581035 ↩
3. http://www.cnblogs.com/pchgo/archive/2011/09/19/2181248.html ↩
4. http://blog.youkuaiyun.com/chosen0ne/article/details/7319807 ↩
5. http://www.open-open.com/lib/view/open1430982247726.html ↩