This is a much better explanation on the use of *args and **keywordargs (**kwargs)
http://www.saltycrane.com/blog/2008/01/how-to-use-args-and-kwargs-in-python/ On Thu, Mar 14, 2013 at 6:22 PM, Andre Terra <[email protected]> wrote: > About the asterisks, please checkout this link: > > http://stackoverflow.com/questions/4306574/python-method-function-arguments-starting-with-asterisk-and-dual-asterisk > > the difference between dict['key'] and dict.get('key', 'something') is > that the second doesn't raise a KeyError exception when 'key' isn't in the > dict; instead, it returns 'something'. this allows for shorter code. please > compare: > > try: > max_retries = config['max_retries'] > except KeyError: > max_retries = 10 > > versus > > max_retries = config.get('max_retries', 10) > > > > Cheers, > AT > > > On Thu, Mar 14, 2013 at 6:17 PM, lamen <[email protected]> wrote: > >> Hello, >> >> Not sure what the difference is in the usage of attrs >> I could not find the documentation for this although I'm sure it's going >> to be obvious after the fact. >> >> Also, could someone tell me what the double asterisks mean in the line >> return Comment(**attrs) >> ? >> >> Is this some type of variable length parameter list? How would >> >> return Comment(*attrs) >> >> and >> >> return Comment(attrs) >> vs >> >> be different? >> >> Thank you! >> >> class CommentSerializer(serializers.Serializer): >> email = serializers.EmailField() >> content = serializers.CharField(max_length=200) >> created = serializers.DateTimeField() >> >> def restore_object(self, attrs, instance=None): >> if instance is not None: >> instance.title = attrs['title'] >> instance.content = attrs['content'] >> instance.created = attrs['created'] >> return instance >> return Comment(**attrs) >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Django users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/django-users?hl=en. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/django-users?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
