1.生成随机数

          import random    #这个是注释，引入模块rnd = random.randint(1,500)#生成1-500之间的随机数

2.读文件

         f = open("c:\\1.txt","r")lines = f.readlines()#读取全部内容for line in lines:print line

3.写文件

        f = open("c:\\1.txt","r+")#可读可写模式f.write("123")#写入字符串

4.正则表达式，读取tomcat的日志并打印日期

     import reregx = "\d\d\d\d-\d\d-\d+"f = open("c:\stdout.log","r")i = 0for str in f.readlines():if re.search(regx,str):Response.write(str+"<br>")if i>10:break#由于是测试，只分析十行i=i+1f.close();

5.连接数据库

import pgdbconn = pgdb.connect(host='localhost',databse='qingfeng',user='qingfeng',password='123')cur = conn.cursor() cur.execute("select * from dream") print cur.rowcount

6.SAX处理xml:

 import stringfrom xml.sax import saxlib, saxextsclass QuotationHandler(saxlib.HandlerBase):"""Crude sax extractor for quotations.dtd document"""def __init__(self):self.in_quote = 0self.thisquote = ''def startDocument(self):print '--- Begin Document ---'def startElement(self, name, attrs):if name == 'quotation':print 'QUOTATION:'self.in_quote = 1else: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 = 0else: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()

7.python的GUI模块标准的是Tkinter,也有QT和MFC的模块，有兴趣的大家自己搜索下

        import Tkinterroot=Tkinter.Tk()my=Label(root,"Welcome to python's world")my.pack()root.mainloop()