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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
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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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Let's say I have this:
a = {1: __class}
Is there any alternative to this ugly piece a[1]() ?
Also, tried a[1].__call__(argument) but PyCharm complains about Expected type 'type', got X instead
It seems to me that it defeats this statement:
Explicit is better than implicit
I am not asking what is the correct form of doing it. I use this form, and I know is right. I only asked for any alternatives.
While there is nothing wrong with a[1](), if you really want to argue that it's not explicit enough...
the_callable_object_that_i_pulled_from_the_dictionary= a[1]
the_callable_object_that_i_pulled_from_the_dictionary()
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By 'true function' I mean a function that cannot be recreated with ordinary python logic. For example the append function could simply be done by creating a list one larger (through lens if you dont define that as a function) than that of the original, and then transfering the contents plus that one from a user input.
If I understand your question correctly, the answer is none. You can implement the entire specification of python, in python. It is self-hosting, as are many other languages.
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Which name is given a function that is separated by undescore.
function_name.
And to a function like FunctionName? and what would be the right one for python and ANSI C.??
Function names like func_one are written in snake case, while functions written like FunctionOne are written in Pascal case, which is a subset of Camel case where the first letter is also uppercase.
Thanks to #abelenky for pointing out the initial error.
function_name is called a Snake Case. It is the recommended casing for Python.
See this answer for more enlightenment.
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What does : mean in python? I'm learning how to program in python and the tutorial i'm using
doesn't explain what : does. I can't find what : does on the internet either. Please answer :D
In object indices (e.g. some_list[4:-1]), this is called slice notation. You use it to access parts of a list/object instead of single items. See also this question for more information.
On other statements, it is required by the syntax to introduce a new code block, like on try: or if something: