def get_traceback_html(self):

        if issubclass(self.exc_type, TemplateDoesNotExist):
            from django.template.loader import template_source_loaders
            self.template_does_not_exist = True
            self.loader_debug_info = []
            for loader in template_source_loaders:
                try:
                    module = import_module(loader.__module__)
                    if hasattr(loader, '__class__'):
                        source_list_func = loader.get_template_sources
                    else: # NOTE: Remember to remove this branch when we deprecate old template loaders in 1.4
                        source_list_func = module.get_template_sources
                    # NOTE: This assumes exc_value is the name of the template that
                    # the loader attempted to load.
                    template_list = [{'name': t, 'exists': os.path.exists(t)} \
                        for t in source_list_func(str(self.exc_value))]
                except (ImportError, AttributeError):
                    template_list = []
                if hasattr(loader, '__class__'):
                    loader_name = loader.__module__ + '.' + loader.__class__.__name__
                else: # NOTE: Remember to remove this branch when we deprecate old template loaders in 1.4
                    loader_name = loader.__module__ + '.' + loader.__name__
                self.loader_debug_info.append({
                    'loader': loader_name,
                    'templates': template_list,
                })
        if (settings.TEMPLATE_DEBUG and hasattr(self.exc_value, 'source') and
            isinstance(self.exc_value, TemplateSyntaxError)):
            self.get_template_exception_info()

        frames = self.get_traceback_frames()

        unicode_hint = ''
        if issubclass(self.exc_type, UnicodeError):
            start = getattr(self.exc_value, 'start', None)
            end = getattr(self.exc_value, 'end', None)
            if start is not None and end is not None:
                unicode_str = self.exc_value.args[1]
                unicode_hint = smart_unicode(unicode_str[max(start-5, 0):min(end+5, len(unicode_str))], 'ascii', errors='replace')
        from django import get_version
        t = Template(TECHNICAL_500_TEMPLATE, name='Technical 500 template')
        c = Context({
            'exception_type': self.exc_type.__name__,
            'exception_value': smart_unicode(self.exc_value, errors='replace'),
            'unicode_hint': unicode_hint,
            'frames': frames,
            'lastframe': frames[-1],
            'request': self.request,
            'settings': get_safe_settings(),
            'sys_executable': sys.executable,
            'sys_version_info': '%d.%d.%d' % sys.version_info[0:3],
            'server_time': datetime.datetime.now(),
            'django_version_info': get_version(),
            'sys_path' : sys.path,
            'template_info': self.template_info,
            'template_does_not_exist': self.template_does_not_exist,
            'loader_debug_info': self.loader_debug_info,
        })
        return t.render(c)
Manually control flow - when software flow control is enabled.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/views/debug.py/ExceptionReporter.get_traceback_html--crossover with--dataset/ETHPy150Open pyserial/pyserial/serial/serialposix.py/Serial.set_input_flow_control