magic-constraints | Magic Type Introspection And Runtime Parameter Type | Reflection library

 by   huntzhan Python Version: v0.4.0 License: MIT

kandi X-RAY | magic-constraints Summary

kandi X-RAY | magic-constraints Summary

magic-constraints is a Python library typically used in Programming Style, Reflection applications. magic-constraints has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can install using 'pip install magic-constraints' or download it from GitHub, PyPI.

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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            kandi-support Support

              magic-constraints has a low active ecosystem.
              It has 42 star(s) with 2 fork(s). There are 4 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 0 open issues and 23 have been closed. On average issues are closed in 1 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of magic-constraints is v0.4.0

            kandi-Quality Quality

              magic-constraints has 0 bugs and 0 code smells.

            kandi-Security Security

              magic-constraints has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              magic-constraints code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              magic-constraints is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              magic-constraints releases are available to install and integrate.
              Deployable package is available in PyPI.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.
              magic-constraints saves you 889 person hours of effort in developing the same functionality from scratch.
              It has 2032 lines of code, 195 functions and 19 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed magic-constraints and discovered the below as its top functions. This is intended to give you an instant insight into magic-constraints implemented functionality, and help decide if they suit your requirements.
            • 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
            Get all kandi verified functions for this library.

            magic-constraints Key Features

            No Key Features are available at this moment for magic-constraints.

            magic-constraints Examples and Code Snippets

            Introduction
            Pythondot img1Lines of Code : 40dot img1License : Permissive (MIT)
            copy iconCopy
            from 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  
            Quick Start,Usage Of ABCs
            Pythondot img2Lines of Code : 29dot img2License : Permissive (MIT)
            copy iconCopy
            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  
            Quick Start,Runtime Type/Value Checking
            Pythondot img3Lines of Code : 25dot img3License : Permissive (MIT)
            copy iconCopy
            # 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

            QUESTION

            NotNullAttribute missing when checking by reflection
            Asked 2022-Feb-16 at 15:15

            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 15:15

            If 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:

            Source https://stackoverflow.com/questions/71144165

            QUESTION

            golang how to access promoted type
            Asked 2022-Feb-01 at 09:48

            I have a 'common' structure promoted within two specific structures. For example:

            ...

            ANSWER

            Answered 2022-Jan-31 at 22:56

            You don't need reflection. One way is to use an interface:

            Source https://stackoverflow.com/questions/70933451

            QUESTION

            java ModuleLayer : ModuleLayer.Controller add methods don't work
            Asked 2022-Jan-13 at 15:28

            I am using Netbeans 12.5 and java 16

            In an Java Modular Project I have 2 Modules

            ...

            ANSWER

            Answered 2021-Nov-12 at 11:19

            You 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.

            Source https://stackoverflow.com/questions/69932308

            QUESTION

            PropertyInfo.GetValue on Boolean is always True, how to handle False responses
            Asked 2022-Jan-10 at 14:59

            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 14:04

            The premise of the question is incorrect; PropertyInfo.GetValue works just fine - here used with your method with zero changes:

            Source https://stackoverflow.com/questions/70652960

            QUESTION

            How to detect the length of array property using reflection only if it actually is an array?
            Asked 2022-Jan-02 at 11:43

            I'm converting an object based on reflection like this.

            ...

            ANSWER

            Answered 2022-Jan-01 at 18:01

            I 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:

            Source https://stackoverflow.com/questions/70550456

            QUESTION

            How to check if one ParameterizedType represents a sub-type of another ParameterizedType?
            Asked 2021-Nov-27 at 11:55

            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 10:50

            You 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:

            Source https://stackoverflow.com/questions/70105878

            QUESTION

            Powershell generate System.Type out of String
            Asked 2021-Nov-04 at 19:41

            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 16:14

            Use the -as type conversion operator:

            Source https://stackoverflow.com/questions/69842375

            QUESTION

            How do I get all Record fields and its values via reflection in Java 17?
            Asked 2021-Oct-15 at 15:45

            I had a class:

            ...

            ANSWER

            Answered 2021-Oct-13 at 10:58

            Your class and record aren't equivalent: records have private fields.

            Class#getFields() returns public fields only.

            You could use Class#getDeclaredFields() instead.

            Source https://stackoverflow.com/questions/69554180

            QUESTION

            How to unit test an internal method or private method in an abstract class in c#?
            Asked 2021-Sep-04 at 09:26

            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 03:12

            You 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):

            Source https://stackoverflow.com/questions/69051979

            QUESTION

            enable templated base class only for derived classes
            Asked 2021-Aug-29 at 08:59

            How would I go about doing the equivalent of the following?

            ...

            ANSWER

            Answered 2021-Aug-29 at 08:59

            In 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):

            Source https://stackoverflow.com/questions/68969652

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install magic-constraints

            You can install using 'pip install magic-constraints' or download it from GitHub, PyPI.
            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.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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