收集的一些python程序，实用并且有趣

这几天有空就做做python,下面是我收集的一些代码，大家可以看看，python真的很有有趣！

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: tdout.log","r")      i = 0      for 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+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。还有几个网络编程和RPC的例子，代码太长，具体见http://www.javaeye.com/viewtopic.php?t=10115

7。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()8.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()

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

        myLabel.pack()

        root.mainloop()