Hi, 
I'm creating this topic to see if there is interest to implement positional 
arguments in queryset filtering.

Current situation 

Currently the only way to use positional arguments to filter can be either:

   - Passing a single or multiple Q objects: 
   
   MyClass.objects.filter(Q(key=value))
   MyClass.objects.filter(Q(key=value), Q(other_key=value))
   
   

   - Passing a couple is also working (not sure if this is a happy 
   accident, should it be removed?) 
   
   MyClass.objects.filter((key, value))
   
   

   - Combination of both is also proven to work 
   
   MyClass.objects.filter((key, value), Q(other_key=value))
   
   

Suggestion 

This feature suggestion is to leverage the case when a non-Q / non couple 
object is passed, so it implicitly interpreted as the value for the model's 
pk.

This could ease/simplify code by omitting pk when this is the only filter 
used:


MyClass.objects.get(value)
# Translates into: MyClass.objects.get(pk=value)


or


MyClass.objects.filter(value)
# Translates into: MyClass.objects.filter(pk=value)


or 


MyClass.objects.filter(Q(value))
# Translates into: MyClass.objects.filter(Q(pk=value))
 

Do you think it's worth it? It could be leveraged to simplify many 
situations.
I'd be happy to proceed to the development myself if this is something 
gathering interest.

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