[python] view plaincopy
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1.生成随机数
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import random #这个是注释，引入模块
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rnd = random.randint(1,500)#生成1-500之间的随机数
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2.读文件
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f = open("c:\\1.txt","r")
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lines = f.readlines()#读取全部内容
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for line in lines
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print line
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3.写文件
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f = open("c:\\1.txt","r+")#可读可写模式
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f.write("123")#写入字符串
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4.正则表达式，读取tomcat的日志并打印日期
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import re
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regx = "\d\d\d\d-\d\d-\d+"
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f = open("c:\stdout.log","r")
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i = 0
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for str in f.readlines():
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if re.search(regx,str):
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Response.write(str+"
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if i>10:break#由于是测试，只分析十行
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i=i+1
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f.close();
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5.连接数据库
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import pgdb
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conn = pgdb.connect
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(host='localhost',databse='qingfeng',user='qingfeng',password='123')
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cur = conn.cursor()
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cur.execute("select * from dream")
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print cur.rowcount
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6.SAX处理xml:
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import string
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from xml.sax import saxlib, saxexts
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class QuotationHandler(saxlib.HandlerBase):
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"""Crude sax extractor for quotations.dtd document"""
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def __init__(self):
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self.in_quote = 0
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self.thisquote = ''
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def startDocument(self):
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print '--- Begin Document ---'
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def startElement(self, name, attrs):
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if name == 'quotation':
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print 'QUOTATION:'
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self.in_quote = 1
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else:
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self.thisquote = self.thisquote + '{'
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def endElement(self, name):
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if name == 'quotation':
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print string.join(string.split(self.thisquote[:230]))+'...',
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print '('+str(len(self.thisquote))+' bytes)\n'
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self.thisquote = ''
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self.in_quote = 0
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else:
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self.thisquote = self.thisquote + '}'
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def characters(self, ch, start, length):
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if self.in_quote:
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self.thisquote = self.thisquote + ch[start:start+length]
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if __name__ == '__main__':
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parser = saxexts.XMLParserFactory.make_parser()
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handler = QuotationHandler()
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parser.setDocumentHandler(handler)
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parser.parseFile(open("sample.xml"))
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parser.close()
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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
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import Tkinter
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root=Tkinter.Tk()
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my=Label(root,"Welcome to python's world")
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my.pack()
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root.mainloop()
