您的位置：首页 > 编程语言 > Python开发
python核心编程二十章例题asvcgi.py中的错误与修改

2016-07-27 12:21 465 查看
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-8

from cgi import FieldStorage
from os import environ
from cStringIO import StringIO
from urllib import quote, unquote
from string import join, capwords

class 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=Back
ONCLICK="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()
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理
标签： python 核心编程
相关文章推荐
新的分享
章节导航