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why UnboundLocalError occure

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def post_edit(request,pk):
post =get_object_or_404(Post, pk=pk)
if request.method=="POST":
form=PostForm(request.POST,instance=post)
if form.is_valid():
post=form.save(commit=False)
post.author= request.user
post.published_date=timezone.now()
post.save()
return redirect('post_detail',pk=post.pk)
else:
form = PostForm(instance=post)
return render (request,'blog/post_edit.html',{'form':form})
Oct 28 '17 #1
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