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Python Django Basics Model Administration First app view

Posted by Banjo Quint
Banjo Quint
1,452 Points

Code challenge with django

Can anyone advise me on this, why is it a bummer? Thanks for the help so far

articles/views.py 
from django.http import HttpResponse

# Write your views here
from .models import Article

def article_list(request):
    articles = Article.objects.all()
    article_len = len(articles)
    return HttpResponse("There are " + article_len + "articles")
csr13
csr13
33,293 Points

Ok, I think this might answer your question.

  • If the variable article_len is populated by an int type then Python will throw you a [ TypeError: can only concatenate str (not "int") to str ], as you would be trying to do just that.
def article_list(request):
    articles = Article.objects.all() # quering all Article Objects
    article_len = len(articles) # getting an integer I assume.
    # if the variable article_len is populated by an int type then Python will throw you
    # a TypeError: can only concatenate str (not "int") to str.
    return HttpResponse("There are " + article_len + "articles") # here is the type error.

You can do what has already been suggested -> using .format() as format converts to string.

return HttpResponse("There are {} articles.".format(len(articles)))

You can also do the conversion from int to string while concatenating.

return HttpResponse("There are " + str(article_len) + "articles.")

Or you can do :

return HttpResponse("There are s% articles." % ( len( articles ) ) )

2 Answers

Cheo R
Cheo R
37,150 Points
Cheo R
Cheo R
37,150 Points

Not sure why (maybe the regex they use to check answer), but I got it to pass keeping your code except, returning the string with format.

HttpResponse("There are {} articles".format(article_len))
Banjo Quint
Banjo Quint
1,452 Points
Banjo Quint
Banjo Quint
1,452 Points

using format worked, thanks for all your efforts. PHP would have allowed it though!