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

 

5。连接数据库

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。SAX处理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()

 

 

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