[代码] [Python]代码

01    1.生成随机数

02              import random    #这个是注释，引入模块

03              rnd = random.randint(1,500)#生成1-500之间的随机数

04    

05    2.读文件

06    

07             f = open("c:\\1.txt","r")

08             lines = f.readlines()#读取全部内容

09             for line in lines

10                     print line

11    3.写文件

12            f = open("c:\\1.txt","r+")#可读可写模式

13            f.write("123")#写入字符串

14    

15    4.正则表达式，读取tomcat的日志并打印日期

16    

17         import re

18         regx = "\d\d\d\d-\d\d-\d+"

19         f = open("c:\stdout.log","r")

20         i = 0

21         for str in f.readlines():

22            if re.search(regx,str):

23                 Response.write(str+"<br>")

24                  if i>10:break#由于是测试，只分析十行

25                  i=i+1

26         f.close();

27    

28    5.连接数据库

29    

30    import pgdb

31    

32    conn = pgdb.connect

33    

34    (host='localhost',databse='qingfeng',user='qingfeng',password='123')

35    

36            cur = conn.cursor()

37    

38            cur.execute("select * from dream")

39    

40            print cur.rowcount

41    

42    6.SAX处理xml:

43    

44          import string

45          from xml.sax import saxlib, saxexts

46    

47          class QuotationHandler(saxlib.HandlerBase):

48              """Crude sax extractor for quotations.dtd document"""

49    

50              def __init__(self):

51                      self.in_quote = 0

52                      self.thisquote = ''

53    

54              def startDocument(self):

55                  print '--- Begin Document ---'

56    

57              def startElement(self, name, attrs):

58                  if name == 'quotation':

59                      print 'QUOTATION:'

60                      self.in_quote = 1

61                  else:

62                      self.thisquote = self.thisquote + '{'

63    

64              def endElement(self, name):

65                  if name == 'quotation':

66                      print string.join(string.split(self.thisquote[:230]))+'...',

67                      print '('+str(len(self.thisquote))+' bytes)\n'

68                      self.thisquote = ''

69                      self.in_quote = 0

70                  else:

71                      self.thisquote = self.thisquote + '}'

72    

73              def characters(self, ch, start, length):

74                  if self.in_quote:

75                      self.thisquote = self.thisquote + ch[start:start+length]

76    

77          if __name__ == '__main__':

78              parser  = saxexts.XMLParserFactory.make_parser()

79              handler = QuotationHandler()

80              parser.setDocumentHandler(handler)

81              parser.parseFile(open("sample.xml"))

82              parser.close()

83    

84    

85    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

86    

87            import Tkinter

88    

89            root=Tkinter.Tk()

90    

91            my=Label(root,"Welcome to python's world")

92    

93            my.pack()

94    

95            root.mainloop()