收集的一些python程序，實用並且有趣

這幾天有空就做做python,下面是我收集的一些代碼，大家可以看看，Python真的很有有趣！

1。生成隨機數 import random #這個是注釋，引入模塊 rnd = random.randint(1,500)#生成1-500之間的隨機數

2。讀文件

f = open("c:\\1.txt","r") lines = f.readlines()#讀取全部內容 for line in lines print line

3。 寫文件 f = open("c:\\1.txt","r+")#可讀可寫模式 f.write("123")#寫入字符串

4。正則表達式，讀取tomcat的日志並打印日期

import re regx = "\d\d\d\d-\d\d-\d+" f = open("c: tdout.log","r") i = 0 for str in f.readlines(): if re.search(regx,str): Response.write(str+"
") if i>10:break#由於是測試，只分析十行 i=i+1 f.close();

5。連接數據庫

import pgdb

conn = pgdb.connect(host='localhost',databse='qingfeng',user='qingfeng',passWord='123')

cur = conn.cursor()

cur.execute("select * from dream")

print cur.rowcount 6。還有幾個網絡編程和RPC的例子，代碼太長，具體見http://www.Javaeye.com/vIEwtopic.PHP?t=10115

7。SAX處理XML:

import string from XML.sax import saxlib, saxexts

class QuotationHandler(saxlib.HandlerBase): """Crude sax extractor for quotations.dtd document"""

def __init__(self): self.in_quote = 0 self.thisquote = ''

def startDocument(self): print '--- Begin Document ---'

def startElement(self, name, attrs): if name == 'quotation': print 'QUOTATION:' self.in_quote = 1 else: self.thisquote = self.thisquote + '{'

def endElement(self, name): if name == 'quotation': print string.join(string.split(self.thisquote[:230]))+'...', print '('+str(len(self.thisquote))+' bytes)\n' self.thisquote = '' self.in_quote = 0 else: self.thisquote = self.thisquote + '}'

def characters(self, ch, start, length): if self.in_quote: self.thisquote = self.thisquote + ch[start:start+length]

if __name__ == '__main__': parser = saxexts.XMLParserFactory.make_parser() handler = QuotationHandler() parser.setDocumentHandler(handler) parser.parseFile(open("sample.XML")) parser.close()8.Python的GUI模塊標准的是Tkinter,也有QT和MFC的模塊，有興趣的大家自己搜索下

import Tkinter

root=Tkinter.Tk()

myLabel(root,"Welcome to Python's world")

myLabel.pack()

root.mainloop()