Python 常用代码片段

Sephiroth 发布于 2010年11月15日 13时 (0评) 4人收藏此代码，我要收藏(?)
一些比较常用的代码片段
标签： python
代码片段(1)

[代码] [Python]代码

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+"<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.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() 
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