sumtype | style library for defining immutable sum types | Functional Programming library
kandi X-RAY | sumtype Summary
kandi X-RAY | sumtype Summary
A namedtuple-style library for defining immutable sum types in Python. (Get it on PyPI). You may know sum types under a different name – they're also referred to as tagged unions, enums in Rust/Swift, and variants in C++. If you haven't heard about them yet, here's a nice introduction. The current stable version is 0.10.0. The library supports Python 3.5+. The core code has lived in various utils folders for about a year, before I got tired of copying it around and decided to release it as an independent package. (see also: Should I use it?).
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Top functions reviewed by kandi - BETA
- Creates a sum type from a list of variants .
- Create a subclass of untyped sum type .
- This is the main function .
- Create a new sum type .
- Create replacement for a variant definition .
- Generate a simple example .
- Create a setter for this variant .
- Return a list of valid names for a typed spec .
- returns a function that returns the conversion function for this variant
- Decorator to handle a matching case .
sumtype Key Features
sumtype Examples and Code Snippets
Lines of Code : 31License : Permissive (BSD-3-Clause)
Copy>>> from sumtype import sumtype
>>> from typing import Tuple
>>>
>>> class Thing(sumtype):
... def Foo(x: int, y: int): ...
... def Bar(y: str, hmm: Tuple[str, str]): ...
... def Zap(): ...
...
>> >>> def do_something(val: Thing):
... if val.is_Foo():
... print(val.x * val.y)
... elif val.is_Bar():
... print('The result is', val.y, ''.join(val.hmm))
... elif val.is_Zap():
... print('Whoosh!')
... >>> # Foo(x: int, y: int) -> Thing
>>> Thing.Foo(x=1, y=2)
Thing.Foo(x=1, y=2)
>>> Thing.Foo(x='should be an int', y=2)
Traceback (most recent call last):
...
TypeError: type of argument "x" must be int; got str instea Community Discussions
Trending Discussions on sumtype
QUESTION
I'm working on a project in the D language and I want to use a module from the standard library called std.sumtype. I'm on debian oldstable, and I've tried both GDC and LDC. DMD is unavailable, because I'm using a machine with an armhf architecture. Neither of these compilers can find std.sumtype, despite it being in the standard library. I also tried downloading 3 different versions of sumtype.d from the phobos repositories of all three D compilers. Each of these would not compile. How can I use this? Am I on the wrong version?
ANSWER
Answered 2022-Jan-13 at 20:49std.sumtype is a pretty new package that was added in 2.097.0: https://dlang.org/changelog/2.097.0.html#std-sumtype so the debian oldstable packages probably don't have it yet as you would need at least:
- DMD 2.097.0
- LDC 1.27.0 (beta.1 or above)
- upcoming GDC in May 2022 (see announcement)
If you want to use the latest compiler you could always download the latest LDC archive and extract it somewhere and run it from there or use the install.sh script from the download page for portable and multiple simultaneous installs.
std.sumtype is an adoption of the dub package sumtype so if you are using dub, you can depend on that as well and not need to get another compiler outside the package manager.
QUESTION
I can see a flicker within my recycler view right at the top. The flicker seems to resemble the top lines of my drawable shapes in the recycler view item.xml. I have made various adjustments to lines and other things to see if I could prevent the flicker but nothing appears to be working.
Here is my code;
Activity
...ANSWER
Answered 2020-Dec-26 at 16:02No resolution found to date. However, based on limited testing it seems to vary by device
QUESTION
I have a sum type of possible outcomes, and in every outcome there is a certain "Result" that I want to focus on. I know how to get that "Result" from each of the outcomes (I have a bunch of prisms for that), but I don't know how to combine these prisms so that I can grab the "Result" from the whole sumtype, without worrying which case I'm on.
Simplified example:
...ANSWER
Answered 2020-Jan-30 at 14:01Once a prism comes to focus, it loses the context. So I don't see a way to define _result in terms of _one and _another. But you can certainly do better than resorting to unsafePartial:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install sumtype
You can use sumtype 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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