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Groups > comp.lang.python > #29252

Re: cannot concatenate 'str' and 'list' objects

Date 2012-09-15 11:13 -0500
From Chris Gonnerman <chris@gonnerman.org>
Subject Re: cannot concatenate 'str' and 'list' objects
References <071ad036-77ca-42d3-b68d-0dd3e3fac43e@googlegroups.com> <9c166e95-e70f-4294-833b-1071a24c6d6d@googlegroups.com>
Newsgroups comp.lang.python
Message-ID <mailman.762.1347726873.27098.python-list@python.org> (permalink)

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On 09/15/2012 10:23 AM, Νικόλαος Κούρας wrote:
> I swicthed back my code to:  f = open( '../' + page )
>
> and http://superhost.gr works which means that line gets parsed correctly.
>
> Only when i post data to the text area boxes iam getting the error:
>
> cannot concatenate 'str' and 'list' objects
>
> how is this possible to work before and NOT work when i enter data to the page for storing to the database?
You really need to add some print-type diagnostics to your script 
temporarily, just to see what you are actually getting for parameters. 
For example, put this:

print "Content-type: text/plain\n"

near the top so you can get a source printout, then add

print `page`

just before you attempt your open() call so you can see what the exact 
Python representation of page is. Do similarly for other problems in 
your code. Don't leave such an "instrumented" copy of your CGI script on 
your site for very long and you should be safe.

Also, consider using the built-in cgi traceback feature in your scripts, 
at least while you are debugging them (though you probably want to 
remove the traceback after you are "in production").

-- Chris.

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Thread

cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 05:22 -0700
  Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 05:26 -0700
  Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-15 22:33 +1000
    Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 06:28 -0700
      Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-15 23:38 +1000
        Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 06:53 -0700
          Re: cannot concatenate 'str' and 'list' objects Peter Otten <__peter__@web.de> - 2012-09-15 16:29 +0200
            Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 07:51 -0700
              Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 00:55 +1000
            Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 07:51 -0700
        Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 06:53 -0700
          Re: cannot concatenate 'str' and 'list' objects Roy Smith <roy@panix.com> - 2012-09-15 10:21 -0400
            Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 07:44 -0700
              Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 00:49 +1000
              Re: cannot concatenate 'str' and 'list' objects Roy Smith <roy@panix.com> - 2012-09-15 11:01 -0400
                Re: cannot concatenate 'str' and 'list' objects Chris Gonnerman <chris@gonnerman.org> - 2012-09-15 11:09 -0500
    Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 06:28 -0700
  Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 07:56 -0700
  Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 08:01 -0700
  Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 08:06 -0700
    Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 01:23 +1000
  Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 08:23 -0700
    Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 01:44 +1000
      Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 09:04 -0700
        Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 02:25 +1000
          Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 09:53 -0700
            Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 02:56 +1000
              Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 10:22 -0700
                Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 10:26 -0700
                Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 03:42 +1000
                Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 10:59 -0700
                Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 04:02 +1000
                Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 11:10 -0700
                Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 09:11 +1000
                Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 11:10 -0700
                Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 10:59 -0700
                Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 10:26 -0700
              Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 10:22 -0700
          Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 09:53 -0700
      Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 09:04 -0700
    Re: cannot concatenate 'str' and 'list' objects Chris Gonnerman <chris@gonnerman.org> - 2012-09-15 11:13 -0500
  Re: cannot concatenate 'str' and 'list' objects Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2012-09-15 08:33 -0700
    Re: cannot concatenate 'str' and 'list' objects Chris Angelico <rosuav@gmail.com> - 2012-09-16 01:46 +1000

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