3,940 questions
0
votes
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24
views
Add an optional keyword argument to the signature of a python function? [duplicate]
I have a python decorator, apply_suffix which adds a suffix keyword argument to a python function.
import functools
def add_suffix(func):
@functools.wraps(func)
def wrapper(*args, suffix: str ...
- 61
0
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0
answers
36
views
How to create a variadic generic container with heterogeneous types in Python 3.13 using PEP 646 and PEP 695?
I'm experimenting with PEP 646 Variadic Generics and PEP 695 Class/Function Scoped TypeVars in Python 3.13. My goal is to create a heterogeneous container that stores items (functions, in this example)...
0
votes
1
answer
48
views
How do I initialize empty variable for boto3 client
I'd like to do a simple check if a variable for boto3 client is empty. I tried following approach:
"""Example of boto3 client lazy initialization"""
from typing import ...
- 2,051
1
vote
1
answer
93
views
How to prevent type alias defined in a stub file from being used in other modules?
I'm working on a Python 3.13.1 project using mypy 1.14.0 for static type checking.
I have a module named module.py with a function function that returns a type with a very long name,
...
- 55
4
votes
1
answer
106
views
Is this a false positive [override] error? "Signature of (method) incompatible with supertype"
Although the method signature in Sub is compatible with Super, mypy rejects the override: Signature of "method" incompatible with supertype "Super".
I'm using
python 3.13.1
mypy 1....
- 55
0
votes
1
answer
42
views
Pyre: `Invalid class instantiation` on a factory pattern with ABC type hint
I have implemented a factory pattern but Pyre-check trips over the type-hinting, thinking I want to instantiate the mapping dict type hint: type[MyClassABC]
Here is a minimum example, also a pyre-...
- 458
4
votes
2
answers
93
views
How to make mypy correctly type-check a function using functools.partial?
I'm trying to create a function that returns a partially applied callable, but I'm encountering issues with mypy type checking.
HEre Is my first implementation:
Help me to explain my question for ...
- 1,887
1
vote
1
answer
128
views
How to add Python type annotations to a class that inherits from itself?
I'm trying add type annotations to an ElementList object that inherits from list and can contain either Element objects or other ElementGroup objects.
When I run the following code through mypy:
from ...
- 4,432
1
vote
0
answers
60
views
Pyre-check error for @property: Undefined attribute: `<class>` has no attribute `<attribute>`
I use pyre-check for type checking my python code, with strict setting on. It works fine except for OOP properties.
Example code:
class MyClass:
def __init__(self, full_name: str):
self....
- 458
0
votes
0
answers
36
views
How to make IDE type-checking recognize dynamically added methods from a class decorator in Python?
This is my code:
from typing import Type, TypeVar
T = TypeVar("T")
class NewMethodsMixin:
def new_method(self) -> str:
"""This is a new method added by a ...
2
votes
1
answer
27
views
How to have Pyright infer type from an enum check?
Can types be associated with enums, so that Pyright can infer the type from an equality check? (Without cast() or isinstance().)
from dataclasses import dataclass
from enum import Enum, auto
class ...
- 23
0
votes
1
answer
114
views
Python typing warning when overriding a method with different returns depending on parameters
Here is an example of my issue
from typing import Literal, overload
@overload
def do_something(a: str, b: str="", no_return: Literal[False]=False) -> str: ...
@overload
def do_something(...
- 89
0
votes
0
answers
28
views
Select query in SQLAlchemy with mypy - Argument 1 to "where" of "Select" has incompatible type "bool"; expected "ColumnElement[bool]
When querying some params in an endpoint:
duplicate_integration = select(Integration).where(
integration_create.provider_accounting_id == Integration.provider_accounting_id,
...
- 35
1
vote
0
answers
37
views
Python typing is rejecting override of a property with a child of its type
Here is an example of my issue:
class Foo:
pass
class FooChild(Foo):
pass
class Bar:
def __init__(self):
self.prop: Foo
class BarChild(Bar):
def __init__(self):
self....
- 89
0
votes
1
answer
74
views
Type hints for a function (multiprocessing)
The following function creates an instance of a class that can be shared between processes:
def create_shared_object (constructor: ?) -> ?:
from multiprocessing.managers import BaseManager;
...
- 31