1  result = PyEval_CallObject(tmp_callback, args);
   2      // result == NULL means an error occured
   3      if (PyErr_Occurred()) {
   4          PyObject* ptype;
   5          PyObject* pvalue;
   6          PyObject* ptraceback;
   7          PyErr_Fetch(&ptype, &pvalue, &ptraceback);
   8          printf("Error occurred on line: %d", ((PyTracebackObject*)ptraceback)->tb_lineno);
   9          // Restore exception instead of disposing of it
  10          PyErr_Restore(ptype, pvalue, ptraceback);
  11          PyErr_Print();
  12  
  13          Py_XDECREF(ptype);
  14          Py_XDECREF(pvalue);
  15          Py_XDECREF(ptraceback);
  16      }

via http://www.ragestorm.net/tutorial?id=21

   1  def requires_authentication(method):
   2      """
   3      self points to a SheisseController instance instead of the decorator function.
   4      """
   5      def wrapper(self, *args, **kwargs):
   6          if self._requires_authentication == True and self._authenticated == False:
   7              return response('403 Forbidden or whatever')
   8  
   9          return method(self, *args, **kwargs)
  10      return wrapper
  11  
  12  class SheisseController:
  13    @requires_authentication
  14    def index(self):
  15  

   1  from xml.etree.ElementTree import fromstring, tostring
   2  
   3  namespace = 'https://xxx.com/xxx'
   4  element = fromstring(xml)
   5  
   6  device = element.find('.//{%s}Device' % namespace)
   7  detail = device.find('.//{%s}Details' % namespace)
   8  series = device.findall('.//{%s}Series' % namespace)

Watch out for namespaces…

First you need to install simplejson:

   1  easy_install simplejson

Now you can dump data to JSON:

   1  import simplejson as json
   2  
   3  class Something:
   4  
   5      def __init__(self):
   6          self.test = "test"
   7  
   8      def to_json(self):
   9          return json.dumps(self.__dict__)

Or if you have complex objects:

   1  import simplejson as json
   2  class Something:
   3  
   4      def __init__(self):
   5          self.test = [Other('a', 'b'), Other('a', 'c')]
   6  
   7      def to_json(self):
   8          return json.dumps([p.__dict__ for p in self.devices])

If you’re getting an error similar to this one on Ubuntu:

   1  $ 2010-01-07 11:35:20: (log.c.97) server started 
   2  2010-01-07 11:35:20: (mod_fastcgi.c.1051) the fastcgi-backend /usr/bin/python2.5 /var/www/xxx/app.py failed to start: 
   3  2010-01-07 11:35:20: (mod_fastcgi.c.1055) child exited with status 1 /usr/bin/python2.5 /var/www/xxx/app.py 
   4  2010-01-07 11:35:20: (mod_fastcgi.c.1058) If you're trying to run PHP as a FastCGI backend, make sure you're using the FastCGI-enabled version.
   5  You can find out if it is the right one by executing 'php -v' and it should display '(cgi-fcgi)' in the output, NOT '(cgi)' NOR '(cli)'.
   6  For more information, check http://trac.lighttpd.net/trac/wiki/Docs%3AModFastCGI#preparing-php-as-a-fastcgi-programIf this is PHP on Gentoo, add 'fastcgi' to the USE flags. 
   7  2010-01-07 11:35:20: (mod_fastcgi.c.1365) [ERROR]: spawning fcgi failed. 
   8  2010-01-07 11:35:20: (server.c.902) Configuration of plugins failed. Going down. 

check the following:

• are the /var/www and /var/www/python-test directories readable by the www-data group? If not: chgrp -R /var/www
• are you specifying the full path to both python binary and the script?
• have you installed flup? If not: sudo easy_install flup or sudo easy_install-2.5 flup
• can the www-data user run the script? Check with: su – www-data then /usr/bin/python2.5 /var/www/xxx/app.py.
• does your configuration work? This works for me:

   1  "/app.py" => ((
   2                  "bin-environment" => (
   3                      "REAL_SCRIPT_NAME" => ""
   4                  ),
   5                  "check-local" => "disable",
   6                  "min-procs" => 1,
   7                  "bin-path" => "/usr/bin/python2.5 /var/www/xxx/app.py",
   8                  "socket"   => "/tmp/fastcgi.socket"
   9          ))