python简单介绍

Python简单介绍

Guixing Baiguixing@staff.sina.com.cn

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特点

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简单易学

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功能强大

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兼容性好

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扩展性好

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开源

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例子

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好工具iPython

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内建函数build-in

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print

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open,range,lambda

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map,filter

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模块

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sys,os

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time,datetime

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hashlib

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Tips

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[i for i in lst if i]

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[i.strip() for i in lst if i]

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def fun(arg1,arg2)

d={arg1:11,arg2:22}

fun(d[arg1],d[arg2])

fun(**d)

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p = [a,b,c]#want a/b/cos.path.join(*p)

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a=[a,b,c]#want a_b_c or a*b*c’_’.join(a)’*’.join(a)b=’fuck’#want fuck! fuck!...”%s! ” % (b) * 20

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源代码style guide

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tab,space

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def fun():tab>a=xx....return a

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好4个space

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#!/usr/bin/env python# coding=utf-8

# -*- coding: utf-8 -*-

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#NOimport os,sys#Yesimport osimport sys#Butfrom os import popen,popen2

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#Yesa = 1 + 2blockq = 3 + 4#Noa = 1 + 2blockq = 3 + 4

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1行不超79etc.

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Py3khas come

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Style Changes

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4-spaceONLY

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• None, as 成了关键字

• print 成了函数

• dict.has_key 改用in操作符

• int和long没有差别了

• 所有的strings都是Unicode

• 不可比的类型之间比较将出异常

• <>操作符没有了，!=代替

• apply()用f(*args,**kw)代替

• xrange()用rang()代替

• map和filter没有了，list可以管

• etc.

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ModuleChanges

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• Removed

• sha,md5: hashlib代替

• mimetools: email package代替

• timing: time.clock()代替

• Renamed

• cPickle: _pickle

• StringIO/cStringIO: 成了io的一个class

• HTMLParser: http.client

• BaseHTTPServer: http.server

• CGIHTTPServer: http.server

• SimpleHTTPServer: http.server

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路漫漫其修远兮！

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Q&A?

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参考资料• PEP: http://www.python.org/dev/peps/

• 8: Style Guide for Python Code

• 3000: Python 3000

• 263: Defining Python Source Code Encodings

• Py3k: http://wiki.python.org/moin/Python3.0

• Python Shell Tab Completion: http://blog.yzlin.org/2008/12/22/75/

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• iPython: http://ipython.scipy.org/moin/

• python常用模块: http://wiki.woodpecker.org.cn/moin/PyCommonUsageMod

• python中文处理: http://wiki.woodpecker.org.cn/moin/PyInChinese

• Python编辑速度技巧: http://wiki.woodpecker.org.cn/moin/PyOptimize

• vim的tabstop: http://blog.khsing.net/2008/12/vims-tabstop.html

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Thanks!

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