python核心编程(文本处理)

1、csv文件读写

!/usr/bin/env python

import csv from distutils.log import warn as printf

DATA = ( (9, 'Web Clients and Servers', 'base64, urllib'), (10, 'Web Programming: CGI & WSGI', 'cgi, time, wsgiref'), (13, 'Web Services', 'urllib, twython'), ) printf('***writing csv data') f=open('bookdata.csv','w') writer=csv.writer(f) for record in DATA: writer.writerow(record) f.close()

printf('***reading csv data') f=open('bookdata.csv','r') reader=csv.reader(f) for a,b,c in reader: printf('%s %r %s' %(a,b,c)) f.close()

2、join:

!/usr/bin/python

-- coding: UTF-8 --

str = "-"; seq = ("a", "b", "c"); # 字符串序列 print str.join( seq );

3、zip用法

a = [1,2,3] #此处可迭代对象为列表 b = [4,5,6] c = [4,5,6,7,8] zipped = zip(a,b) zipped <zip object at 0x02B01B48> #返回的是一个对象 list(zipped) [(1, 4), (2, 5), (3, 6)] #使用list()函数转换为列表 list(zip(a,c)) [(1, 4), (2, 5), (3, 6)] zipped = zip(a,b) list(zip(*zipped)) #解压也使用list进行转换 [(1, 2, 3), (4, 5, 6)]

4、python字典转json：json.dumps(xx,indent=xx)

!/usr/bin/env python

from distutils.log import warn as printf from json import dumps from pprint import pprint

BOOKs = { '0132269937': { 'title': 'Core Python Programming', 'edition': 2, 'year': 2007, }, '0132356139': { 'title': 'Python Web Development with Django', 'authors': ['Jeff Forcier', 'Paul Bissex', 'Wesley Chun'], 'year': 2009, }, '0137143419': { 'title': 'Python Fundamentals', 'year': 2009, }, }

printf('*** RAW DICT ***') printf(BOOKs)

printf('\n*** PRETTY_PRINTED DICT ***') pprint(BOOKs)

printf('\n*** RAW JSON ***') printf(dumps(BOOKs))

printf('\n*** PRETTY_PRINTED JSON ***') printf(dumps(BOOKs, indent=4))

5、字典转xml：

!/usr/bin/env python

from xml.etree.ElementTree import Element, SubElement, tostring from xml.dom.minidom import parseString

BOOKs = { '0132269937': { 'title': 'Core Python Programming', 'edition': 2, 'year': 2006, }, '0132356139': { 'title': 'Python Web Development with Django', 'authors': 'Jeff Forcier:Paul Bissex:Wesley Chun', 'year': 2009, }, '0137143419': { 'title': 'Python Fundamentals', 'year': 2009, }, }

books = Element('books') for isbn, info in BOOKs.items(): book = SubElement(books, 'book') info.setdefault('authors', 'Wesley Chun') info.setdefault('edition', 1) for key, val in info.items(): SubElement(book, key).text = ', '.join(str(val).split(':'))

xml = tostring(books) print('*** RAW XML ***') print(xml)

print('\n*** PRETTY-PRINTED XML ***') dom = parseString(xml) print(dom.toprettyxml(' '))

print('*** FLAT STRUCTURE ***') for elmt in books.getiterator(): print(elmt.tag, '-', elmt.text)

print('\n*** TITLES ONLY ***') for book in books.findall('.//title'): print(book.text) 6、xml-rpc通信： 服务端：

* coding:utf-8 *

from xmlrpc.server import SimpleXMLRPCServer

调用函数

def respon_string(str): return "get string:%s"%str

if name == 'main': server = SimpleXMLRPCServer(('localhost', 8888)) # 初始化 server.register_function(respon_string, "get_string") # 注册函数 print ("Listening for Client") server.serve_forever() # 保持等待调用状态

客户端：

* coding:utf-8 *

from xmlrpc.client import ServerProxy

if name == 'main': server = ServerProxy("http://localhost:8888") # 初始化服务器 print (server.get_string("cloudox")) # 调用函数并传参