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I am thinking how to annotate any instance in Python. For class object type will work, for instance or class: object but how to annotate only instance of not specific class, but any?
instances are also typed. classes are of type type as you mention, and instances are of type ThatClass. Consider:
class MyClass:
pass
MyClassRenamed: type = MyClass
my_instance: MyClassRenamed = MyClassRenamed()
Though one must wonder why you'd want to do this to begin with!
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I've tried google but found nothing on this topic and my final option was stack overflow.
Does Valid attribute names, Valid attribute reference and Attribute reference mean the same thing?
Yes, probably putting "valid" as a prefix is just a way to affirmate that you have to create an attribute reference that makes sense or just to follow good habits.
There goes a post to good habits when creating variables/references:
https://towardsdatascience.com/data-scientists-your-variable-names-are-awful-heres-how-to-fix-them-89053d2855be
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I created a class.
After that i instantiated that class by the variable name 'xyz'.
Now is there a way that I can display the name of this variable i.e. print 'xyz' inside __init__in the class??
Like #Patrick Haugh mentioned in the comments, since the right hand side of the assignment is always executed first and then the assignment is evaluated with the result of that execution there is no (easy) way for the right hand side to know what the variable name would be.
Although not good, if you absolutely need to know this piece of information you can always pass the name as a parameter...
xyz = MyClass('xyz')
I believe there is a way of solving what you are asking with Metaprogramming, but since I have not experience in that area I wouldn't dare to give you any advice
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The passstatement is usually a placeholder for future code and is used as a null operation.
But why it's not defined a type in Python. Should't it belong to None type?
Objects have types. Statements do not. pass is a statement, and does not have a type. (Also, None is not a type.)
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I'd like to add or remove some form_extra_fields based on the instance that will be displayed. The documentation is extensive around customizing the form for every member of the class but I'm having problems finding a hook where I can access the instance itself.
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What is the purpose of the code keyword argument that can be passed to a ValidationError constructor? It seems that it is customary to use the name of a key in a form's error_messages dictionary if defined. Nevertheless, from what I can see code is not used for any particular purpose by Django itself.
Thoughts?
In the Source Code, it says that it is because Python2 had a message attribute, so they can't duck type on it, so they used code instead for compatibility. Here's the Source Code link:
https://docs.djangoproject.com/en/dev/_modules/django/core/exceptions/#ValidationError