python核心编程二十章例题asvcgi.py中的错误与修改

来源：互联网发布：徐老师淘宝外设店名字编辑：程序博客网时间：2024/06/07 03:01
在python核心编程例题20.8中，按照作者代码是无法正常运行的，需要修改一下代码。主要是15行修改一下，48-51行添加四段代码。修改后代码如下：
#!/usr/bin/env python# -*- coding:utf-8from cgi import FieldStoragefrom os import environfrom cStringIO import StringIOfrom urllib import quote, unquotefrom string import join, capwordsclass AdvCGI:    header = 'Content-Type: text/html\n\n'    url = '/cgi-bin/advcgi.py'    formhtml = '''<HTML><HEAD><TITLE>Advanced CGI Demo</TITLE></HEAD><BODY><H2>Advanced CGI Demo Form</H2><FORM METHOD=post ACTION="%s" ENCTYPE="multipart/form-data"><H3>My Cookie Setting</H3><LI> <CODE><B>CPPuser = %s</B></CODE><H3>Enter cookie value<BR><INPUT NAME=cookie value="%s"> (<I>optional</I>)</H3><H3>Enter your name<BR><INPUT NAME=person VALUE="%s"> (<I>required</I>)</H3><H3>What languages can you program in?(<I>at least one required</I>)</H3>%s<H3>Enter file to upload</H3><INPUT TYPE=file NAME=upfile VALUE="%s" SIZE=45><P><INPUT TYPE=submit></FORM></BODY></HTML>'''    langSet = ('Python', 'PERL', 'Java', 'C++', 'PHP', 'C', 'JavaScript')    langItem = '<INPUT TYPE=checkbox NAME=lang VALUE="%s"%s> %s\n'    def getCPPCookies(self):                # reads cookies from client        if 'HTTP_COOKIE' in environ:            cookies = [x.strip() for x in environ['HTTP_COOKIE'].split(';')]            for eachCookie in cookies:                if len(eachCookie) > 6 and eachCookie[:3] == 'CPP':                    tag = eachCookie[3:7]                    try:                        self.cookies[tag] = eval(unquote(eachCookie[8:]))                    except (NameError, SyntaxError):                        self.cookies[tag] = unquote(eachCookie[8:])            if 'info' not in self.cookies:                self.cookies['info'] = ''            if 'user' not in self.cookies:                self.cookies['user'] = ''        else:            self.cookies['info'] = self.cookies['user'] = ''        if self.cookies['info'] != '':            self.who, langStr, self.fn = self.cookies['info'].split(':')            self.langs = langStr.split(',')        else:            self.who = self.fn = ''            self.langs = ['Python']    def showForm(self):                        # show fill-out form        self.getCPPCookies()        langStr = ''        for eachLang in AdvCGI.langSet:            if eachLang in self.langs:                langStr = langStr + AdvCGI.langItem % \                    (eachLang, ' CHECKED', eachLang)            else:                langStr = langStr + AdvCGI.langItem % \                    (eachLang, '', eachLang)        if 'user' not in self.cookies or \                self.cookies['user'] == '':            cookieStatus = '<I>(cookie has not been set yet)</I>'            userCook = ''        else:            userCook = cookieStatus = self.cookies['user']        print AdvCGI.header + AdvCGI.formhtml % (AdvCGI.url,              cookieStatus, userCook, self.who, langStr, self.fn)    errhtml = '''<HTML><HEAD><TITLE>Advanced CGI Demo</TITLE></HEAD><BODY><H3>ERROR</H3><B>%s</B><P><FORM><INPUT TYPE=button VALUE=BackONCLICK="window.history.back()"></FORM></BODY></HTML>'''    def showError(self):        print AdvCGI.header + AdvCGI.errhtml % (self.error)    reshtml = '''<HTML><HEAD><TITLE>Advanced CGI Demo</TITLE></HEAD><BODY><H2>Your Uploaded Data</H2><H3>Your cookie value is: <B>%s</B></H3><H3>Your name is: <B>%s</B></H3><H3>You can program in the following languages:</H3><UL>%s</UL><H3>Your uploaded file...<BR>Name: <I>%s</I><BR>Contents:</H3><PRE>%s</PRE>Click <A HREF="%s"><B>here</B></A> to return to form.</BODY></HTML>'''    def setCPPCookies(self):        for eachCookie in self.cookies.keys():            print 'Set-Cookie: CPP%s=%s; path=/' % \                (eachCookie, quote(self.cookies[eachCookie]))    def doResults(self):        MAXBYTES = 1024        langlist = ''        for eachLang in self.langs:            langlist = langlist + '<LI>%s<BR>' % eachLang        filedata = ''        while len(filedata) < MAXBYTES:        # read file chunks            data = self.fp.readline()            if data == '':                break            filedata = filedata + data        else:                                # truncate if too long            filedata = filedata + \                '... <B><I>(file truncated due to size)</I></B>'        self.fp.close()        if filedata == '':            filedata = \                '<B><I>(file upload error or file not given)</I></B>'        filename = self.fn        if not ('user' in self.cookies and self.cookies['user']):            cookieStatus = '<I>(cookie has not been set yet)</I>'            userCook = ''        else:            userCook = cookieStatus = self.cookies['user']        self.cookies['info'] = join([self.who,            join(self.langs, ','), filename], ':')        self.setCPPCookies()        print AdvCGI.header + AdvCGI.reshtml % \            (cookieStatus, self.who, langlist, filename, filedata, AdvCGI.url)    def go(self):                # determine which page to return        self.cookies = {}        self.error = ''        form = FieldStorage()        if form.keys() == []:            self.showForm()            return        if 'person' in form:            self.who = capwords(form['person'].value.strip())            if self.who == '':                self.error = 'Your name is required. (blank)'        else:            self.error = 'Your name is required. (missing)'        if 'cookie' in form:            self.cookies['user'] = unquote(form['cookie'].value.strip())        else:            self.cookies['user'] = ''        self.langs = []        if 'lang' in form:            langdata = form['lang']            if isinstance(langdata, list):                for eachLang in langdata:                    self.langs.append(eachLang.value)            else:                self.langs.append(langdata.value)        else:            self.error = 'At least one language required.'        if 'upfile' in form:            upfile = form["upfile"]            self.fn = upfile.filename or ''            if upfile.file:                self.fp = upfile.file            else:                self.fp = StringIO('(no data)')        else:            self.fp = StringIO('(no file)')            self.fn = ''        if not self.error:            self.doResults()        else:            self.showError()if __name__ == '__main__':    page = AdvCGI()    page.go()
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