but just reporting the discrepancy would leave me a chance to pick which to change. so for the goal of catching this scenario, it doesn't matter which is wrong, i think.
How can I trace a possible bug where class attribute with name
defaults would lose its typing when used in inherited class? This only applies to an attribute with the name defaults.
Never mind, figured it out
It’s not really clear in the mypy release note blog post
@hauntsaninja should stubtest check the package and the stubs against each other when it comes to implicit optional hints? context is 9 messages up, but trio has a parameter
=None and the stubs have : trio.abc.Clock = .... seems like it would be good to have some tool or another able to find this discrepancy.
I'm trying to dynamically add a method to ca ClassDef in a plugin hook.
What I can't work out is: how to construct new Function definitions.
Because those function definitions need types in their args.
But I don't know how to get arbitrary types
And
mypy.nodes.TypeInfo
This message was deleted
It'd be nice if there was autodocumentation for the plugin api
6 replies
Basically, I was getting really annoyed with how a lot of python web developers just do ad hoc interfaces between services. And I wanted to see if I could create a metaprogrammed OpenAPI client; but one where I could also use MyPy to verify you are using the API correctly.
@altendky stubtest does check that default values are a subtype of the arg's type hint
maybe the issue is that your stub is decorated?
@hauntsaninja https://gist.github.com/altendky/3327ab219a04e27f628b92aa6c480d8a here's the minimal example. i can certainly file a ticket if you think it is appropriate.
also, this isn't a pressing issue. at this point i'm starting to just merge the stubs into the package so this is relevant primarily in the context of just improving (i think?
:]) stubtest.
@altendky if i change your repro to create a pyi file instead of a py file in package-stubs, i get:
error: package.f is inconsistent, runtime argument "p" has a default value of type None, which is incompatible with stub argument type builtins.int
Stub: at line 1
def (p: builtins.int =)
Runtime: at line 1 in file /Users/shantanu/tmp/lol/package/__init__.py
def (p=None)altendky @altendky sighs
i'll explore the difference between that and the actual situation. thanks.
Hi, can anyone help me understand what is wrong with my annotations on my code https://bpa.st/MGSOM . mypy thinks there is an error on L8 but I dont understand what is wrong. It looks like mypy correctly restricts to one type of a Union when it enters an if block but it throws that knowledge away when it enters a locally defined function (compare L5 & L7). Is this a mypy bug?
from typing import Union
def foo(X: Union[int, str]) -> bool:
if isinstance(X, str):
reveal_type(X) # str
def g(y: int) -> bool:
reveal_type(X) # Union[int, str]
return len(X) > y # <<<<< error: Argument 1 to "len" has incompatible type "Union[int, str]"; expected "Sized"
return g(10)
reveal_type(X) # int
return bool(X)
Anyone please
Hi folks, like was stated in the documentation, I'm trying to manually go over the stub file created by stubgen so as to provide explicit types where possible instead of using
Any. I'm currently running into a snag where I don't know how to deal with a NewType that I defined - what I'm trying to do results in a mypy error. Please find below a minimal reproduction of the problem. Does anyone have any advice or am I forced to leave it as Any?# test.py
from dataclasses import dataclass
from typing import NewType
A = NewType("A", str)
@dataclass
class Test:
a: A# stubgen'd test.pyi
from typing import Any
A: Any
class Test:
a: A
def __init__(self, a: Any) -> None: ...# trying to remove 'Any' as much as possible
from typing import Type
A: Type[str]
class Test:
a: A # mypy error: "test.A" is not valid as a type
def __init__(self, a: A) -> None: ... # mypy error: "test.A" is not valid as a type
Has anyone experiences with supervising a thesis that has a student working on mypy? I'm going to supervise a bachelors thesis starting in April that is focused on analysing the exhaustiveness of structural pattern matching in mypy (https://pp.ipd.kit.edu/thesis.php?id=323&lang=en), as a colleague of mine developed such an analysis for Haskell.
Any advice about dmypy and mypy giving different results when checking the same code?
% dmypy check -- --local-partial-types dtests/dtests.py dtests/tests
Success: no issues found in 430 source files
% mypy --local-partial-types dtests/dtests.py dtests/tests
dtests/dtestlib/scales/AbstractIterableComparator.py:36: error: Cannot determine type of '_result'
dtests/dtestlib/scales/AbstractIterableComparator.py:39: error: Need type annotation for '_diff' (hint: "_diff: List[<type>] = ...")
dtests/dtestlib/scales/AbstractIterableComparator.py:72: error: Incompatible types in assignment (expression has type "None", variable has type "List[Any]")
dtests/dtestlib/scales/TypeStrictComparator.py:28: error: Cannot determine type of '_result'
dtests/dtestlib/scales/TypeStrictComparator.py:29: error: Cannot determine type of '_result'
dtests/dtestlib/scales/TypeStrictComparator.py:29: error: unused 'type: ignore' comment
dtests/dtestlib/scales/DictComparator.py:34: error: Incompatible types in assignment (expression has type "Dict[<nothing>, <nothing>]", variable has type "List[Any]")
dtests/dtestlib/scales/DictComparator.py:53: error: Incompatible types in assignment (expression has type "None", variable has type "List[Any]")
dtests/dtestlib/scales/DictComparator.py:33: error: unused 'type: ignore' comment
dtests/dtestlib/scales/DictComparator.py:49: error: unused 'type: ignore' comment
dtests/dtestlib/scales/RelaxedComparator.py:28: error: Cannot determine type of '_result'
dtests/dtestlib/scales/RelaxedComparator.py:29: error: Cannot determine type of '_result'
dtests/dtestlib/scales/RelaxedComparator.py:35: error: Redundant cast to "bool"
dtests/dtestlib/scales/RelaxedComparator.py:29: error: unused 'type: ignore' comment
Hi, I'm running into an issue with typevars unifying into object and therefore allowing incorrect code. Example:
T = TypeVar("T")
class Field(Generic[T]):
dtype: Type[T]
default: T
foo = Field(int, "asdf") # I expect this to fail, but instead it typechecks since foo is a Field[object]I found this issue which seems similar but is closed: python/mypy#6559
Is what I'm looking for possible in mypy?
5 replies