170 questions
Score of 1
1 answer
130 views
attrs subclass from non-attrs class not respecting initializer arguments
I get the following error:
$ python attrs_subclass_test.py
Traceback (most recent call last):
File "attrs_subclass_test.py", line 23, in <module>
attrs_sub = AttrsSub(name='...
- reputation score 771
Score of 2
1 answer
124 views
Is there a decorator for attrs factory sugar?
Similar to Decorator for attrs converter, please see this case:
from attrs import define, field, Factory
@define
class MyClass:
name = field(default = Factory(_name_factory, takes_self=True), ...
- reputation score 3605
Score of 1
2 answers
168 views
Dataclass/attrs based orm models and their relationships
I am building a small python application to learn Domain-Driven-Design (DDD) approaches. Therefore I am using a dataclass/attrs class as my domain model and also use this class to imperatively model ...
- reputation score 2535
Score of 1
1 answer
76 views
How to issue warnings from a `attrs` validator with correct `stacklevel`?
I want to use validators to issue warnings for notable but non-catastrophic issues on classes. However, by default warnings will point to the place where the warning was defined, and I want to have ...
- reputation score 322
Score of 0
1 answer
184 views
attrs and class variables
I really like the way how one can define classes via the attrs library.
In particular how the usual syntax of python class variables is hijacked to define instance variables.
But is there a way to get ...
- reputation score 1897
Score of 0
1 answer
96 views
Use attrs or_ validator with mypy
I'm trying to use attrs to define a class that has an attribute that can be either a str or an int. The or_ validator see;s to be exactly what I need but mypy throws an error when using the exact ...
- reputation score 119
Score of 0
1 answer
141 views
cattrs : can I use a json converter in a class method to instantiate an object from a json file?
I have been an extensive user of attrs for two years, but I have discovered cattrs only recently so my question may sound naive.
In my codes, I often use a class method to instantiate an attrs object ...
- reputation score 3
Score of 0
2 answers
97 views
Is there a way to signal an attrs class field so it won't be part of deepcopy / pickle?
I find myself often writing attrs classes that looks something like this:
import attrs
from some_app import Client
@attrs.mutable
class Foo:
_credentials: str = attrs.field(validator=attrs....
- reputation score 137
Score of 0
1 answer
118 views
Enum of dataclass works but frozen attrs doesn't
The built-in enum provides a way to create enums of primitive types (IntEnum, StrEnum).
I'd like to create an enum of structured objects.
One way to do that is with dataclass, and it works:
from ...
- reputation score 846
Score of 0
1 answer
225 views
Unsupported converter, only named functions, types and lambdas are currently supported
Using the complicated example as here https://www.attrs.org/en/stable/api.html#attrs.converters.default_if_none, I get the mypy error: Unsupported converter, only named functions, types and lambdas ...
- reputation score 15
Score of 0
2 answers
954 views
using attrs pre-commit mypy error: Unexpected keyword argument
mypy runs perfectly on terminal, but when running on pre-commit stage, I am getting the error Unexpected keyword argument for every property in my class
from attrs import define, field
@define(
...
- reputation score 15
Score of 0
1 answer
155 views
How to implement class composition
Hi I have a model that contain several items, now all of the items have a set of shared properties: id, name, parent. In addition some of this items are meant only to contain other items. Some are ...
- reputation score 1
Score of 0
1 answer
72 views
Pylint warnings with attrs
I keep getting warnings from pylint while trying to iterate over an attribute in a class that uses the attrs package.
from typing import List
from attrs import define, Factory
@define
class MyClass:
...
- reputation score 1
Score of 0
0 answers
72 views
Is it possible to utilize a lambda function in an python-attrs converter? [duplicate]
I am attempting to automatically create converter functions that require metadata to operate. I am seeing odd behavior when a lambda function is used for the converter.
import attrs
def add(x, y=10):
...
- reputation score 1911
Score of 1
1 answer
299 views
In python Attrs package, how to add a field in the field_transformer function?
The documentation for the python Attrs, the Automatic Field Transformation and Modification section states
...You can add converters, change types, and even remove attributes
completely or create new ...
- reputation score 1911
