So I have this code : And when I create an instance, like this : To access a value (like 3 for example), I know I should do and I would like to know how to access it using and still use Thanks in advance ! Answer Define the __getitem__ function to allow for custom indexing:
Tag: instance
Why is Django forms fields value not rendering in html template for function based update view?
The issue is when i try to update my profile, i do not see the exising value i do not actually know what is wrong with the views.. views.py Answer in your form = UpdateFormExample(request.POST, instance=request.user) this fixed the issue
Two values are same and different after defining a=b=class_name(value1) b=class_name(value2) in python
In the following code, I understand that the print of tree(named in the code) and parent(named in the code) should not be the same. But I do not understand, why the tree is always updating according to the updating of parent? (This question continues the last question here) Code: Output: In the code, it is obvious that the parent is
Why can’t I initialize instances using for loop – Python, class
error: name ‘w1’ is not defined I tried to use for loop to initialize all the workers( w1, w2, w3) so i can access them afterwards. But when I try to access them they say the instance is not defined, is it possible that you cant initialize using for loop. Thanks in advance, beginner here. Answer I think the best
How do I create a class where instantiation only happens if certain conditions are met?
Let’s say I have this class: If I want to instantiate Person I can do: But what if I only want to instantiate Person if name has type str? I tried this: But then when I do: I get this: So all that’s happening is: If name is str, the instance has a .name method If name is not str,
Type hint for instance of subclass
I want to allow type hinting using Python 3 to accept instances which are children of a given class. I’m using the enforce module to check the function typing. E.g.: but it seems like python 3 doesn’t allow for this syntax, returning: Argument ‘x’ was not of type < class ‘A’ >. Actual type was B. Any help? Answer By
How to get instance given a method of the instance?
Now can you get a reference to myInstance if you now only have access to methodReference? Answer If you are using Python 3: Otherwise: and by a similar token, for the class: For this kind of code discovery you should install iPython and use tab, for instance, in your case myReference.+TAB would give: Hence, you don’t need to worry about
Determine if Python variable is an instance of a built-in type
I need to determine if a given Python variable is an instance of native type: str, int, float, bool, list, dict and so on. Is there elegant way to doing it? Or is this the only way: Answer The best way to achieve this is to collect the types in a list of tuple called primitiveTypes and: The types module