magic-constraints | Magic Type Introspection And Runtime Parameter Type | Reflection library
kandi X-RAY | magic-constraints Summary
kandi X-RAY | magic-constraints Summary
magic-constraints implemented (or hacked) a bunch of abstract base classes (ABCs for short) to support type introspection, that is, the isinstance/issubclass operations in Python. Specialization of ABC is support, i.e. Sequence[int] and Sequence[int] are specialized versions of Sequence.
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Top functions reviewed by kandi - BETA
- Decorator for functions that pass positional arguments
- Check and bind parameters
- Return the type for deferred checking
- Check if instance is of type
- Check type declaration
- Checks if type_decl is a n - tuple
- Decorator to check method constraints
- Builds constraints for a given function
- Decorator for functions that pass through the constraints
- Raise a MagicTypeError on the end of the given constraints
- Decorator for methods that pass the constraints
- Checks if type_decl is a type declaration
- Checks if the instance is valid
- Check if obj is a type object
- Check if the instance is valid
- Check if the given instance is a callable
- Load requirements from a file
- Checks that the metaclass is of the metaclass
- Check if the metaclass is of the partial_cls
- Decorator for methods that check return type constraints
- Decorator to check function constraints
- Generate an immutable
- Checks the type_decl argument
- Decorate a function to inspect the given function
- Checks the metaclass against the partial_cls
- Wrapper for method_constraints
magic-constraints Key Features
magic-constraints Examples and Code Snippets
Lines of Code : 40License : Permissive (MIT)
Copyfrom magic_constraints import function_constraints, Optional
# foobar should accept either an int object or a None object.
@function_constraints
def function(foobar: Optional[int]) -> float:
if foobar is None:
# should fail the retur from magic_constraints import Sequence, MutableSequence, ImmutableSequence
# True.
isinstance([1, 2, 3], Sequence)
# True.
isinstance([1, 2, 3], MutableSequence)
# True.
isinstance((1, 2, 3), ImmutableSequence)
# True, Sequence with int.
isinstance # ok.
>>> func1('key', [1, 2, 3])
{'key': [1, 2, 3]}
# failed, bar requires a sequnce.
>>> func1('42 is not a sequence', 42)
Traceback (most recent call last):
...
magic_constraints.exception.MagicTypeError:
MagicTypeError: argume Community Discussions
Trending Discussions on Reflection
QUESTION
What we are trying to do is to list all properties of the class with NotNull attribute. The one from .NET, not from JetBrains. Unfortunately, it looks like NotNullAttribute is removed during the compilation process (or on some other stage) and it can't be observed in the runtime.
Does anyone know why does it happen? Can't find an explanation on the internet/MSDN.
Here is a test that can easily reproduce it. It fails on the second assertion.
...ANSWER
Answered 2022-Feb-16 at 15:15If you use SharpLab you can see in the lowered code that the attribute is indeed removed from the property, and instead is applied to the return parameter:
QUESTION
I have a 'common' structure promoted within two specific structures. For example:
...ANSWER
Answered 2022-Jan-31 at 22:56You don't need reflection. One way is to use an interface:
QUESTION
I am using Netbeans 12.5 and java 16
In an Java Modular Project I have 2 Modules
...ANSWER
Answered 2021-Nov-12 at 11:19You are creating a new module layer containing two modules and establishing access of one of these modules to the other. However, you actually want to establishing access for the currently running main method to one the these modules.
The currently running main method can’t be part of the new module layer it just creates. Assuming standard launcher setup, it belongs to a Controller module loaded by the system class loader as part of the boot-layer.
So, instead of granting access to a new module of the same name in the new layer, you have to change the code to grant access to the already loaded Controller module. Since the new Controller module of the new module layer serves no purpose then, you can remove it from the layer configuration.
QUESTION
Similar to PropertyInfo.GetValue on Boolean is always True although no useful answer was posted.
I'm using Entity Framework to gather objects from a database and I'm trying to create Json structures as strings. However when gathering boolean answers in the same way as other types, the boolean always returns true.
I've tried to cast the value to a boolean here but I originally tried using the same method as other types (just using value). Is there a reason for this or a fix? Thanks
...ANSWER
Answered 2022-Jan-10 at 14:04The premise of the question is incorrect; PropertyInfo.GetValue works just fine - here used with your method with zero changes:
QUESTION
I'm converting an object based on reflection like this.
...ANSWER
Answered 2022-Jan-01 at 18:01I can't think of a solution that's significantly different to yours, fundamentally it feels like it's a custom logic to determine whether a property value is "empty" or not.
Perhaps a pattern matched switch expression might make the code a little cleaner, however, for example:
QUESTION
Given below code snippet, for each field of POJO class, is there a way to check if the type is an integer list or not? The real problem here is the type argument, since it's quite easy to check if it's a list via instanceof or isAssignableFrom.
Lines in main is what I have found so far, but it does not work for those types with more complex class hierarchy.
ANSWER
Answered 2021-Nov-26 at 10:50You are right, this is not an easy problem because of erasure. However, I think it is not unsolvable.
The fundamental principle should be to follow and replace the type variables with actual parameter types all the way to List.
Consider these two classes:
QUESTION
I am dynamically generating .net objects of a certain type like this $MyType=([System.Type]::GetType("System.String")
This works fine for standard .net objects.
I now created a custom class like this
...ANSWER
Answered 2021-Nov-04 at 16:14Use the -as type conversion operator:
QUESTION
I had a class:
...ANSWER
Answered 2021-Oct-13 at 10:58Your class and record aren't equivalent: records have private fields.
Class#getFields() returns public fields only.
You could use Class#getDeclaredFields() instead.
QUESTION
I have to write a unit test for an internal or private method in an abstract class in c#. consider this:
...ANSWER
Answered 2021-Sep-04 at 03:12You need to specify the BindingFlags to be NonPublic in order to find the private method.
I am not sure what is the PrivateObject but this should work (you may change it a little bit to make it suitable for your needs):
QUESTION
How would I go about doing the equivalent of the following?
...ANSWER
Answered 2021-Aug-29 at 08:59In CRTP, T is incomplete in class MyClass : Self {};.
You can add an extra check in a method which should be called/instantiated (such as constructor/destructor):
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Install magic-constraints
You can use magic-constraints like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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