Pyright/mypy: "expr" has no attribute "id" Understanding and Fixing expr has no attribute id in Pyright Mypy Problem You re working on your Python code confidently writing logic only to be greeted with t 2 min read 06-10-2024 8
How can Pylance get the type annotation of a dynamically defined class? Unlocking Type Hints for Dynamic Classes with Pylance Pythons dynamic nature allows us to create classes on the fly providing incredible flexibility However thi 2 min read 05-10-2024 9
How to type annotate a function pointer (function variable) in Python? Type Annotating Function Pointers in Python A Comprehensive Guide Type annotations are a powerful feature in Python that enhance code readability maintainabilit 2 min read 05-10-2024 7
Overloaded functions with overlapping typehints in signature results in error for mypy, but not pyright Mypy vs Pyright When Overloaded Functions Clash with Type Hints Pythons flexibility allows for overloading functions where multiple functions with the same name 2 min read 05-10-2024 10
PyQt6. Operator "-" not supported for types "QPoint" and "QPoint". Pylance(reportGeneralTypeIssues) Py Qt6 Subtracting Q Points Understanding the Error and Finding Solutions Problem You re working with Py Qt6 and trying to subtract two Q Point objects only to 2 min read 05-10-2024 9
How can I cure mypy & Pylance objection to a function that returns a Callable? Mypy and Pylance Why They Object to Functions Returning Callables and How to Fix It Lets face it Pythons dynamic typing can be a blessing and a curse While it o 3 min read 05-10-2024 6
Python Analysis: Type Checking Mode in VS CODE Python Analysis Harnessing the Power of Type Checking Mode in VS Code Tired of runtime errors catching you off guard VS Codes Type Checking Mode can be your bes 2 min read 05-10-2024 8
How to type annotate a decorator to make it Override-friendly? Typing Annotations for Decorators Making Your Code Override Friendly Decorators are a powerful tool in Python adding functionality to existing functions without 2 min read 05-10-2024 12
Python generic protocol: TypeVar is "Unknown" (Pylance) or "Any" (Mypy) Demystifying Type Var Why Pylance Sees Unknown and Mypy Sees Any Lets dive into a common frustration faced by Python developers using type hinting libraries lik 3 min read 05-10-2024 5
Configure Pyright to use Ruff as a linter Ditch the Duplication Configuring Pyright to Use Ruff for Linting Tired of maintaining separate configurations for your Python linter and type checker Want a st 2 min read 05-10-2024 10
Is there a way to specify arbitrary extras in a Python TypedDict? Adding Flexibility to Typed Dicts Handling Arbitrary Extras in Python Typed Dicts are a powerful tool in Python for creating strongly typed dictionaries They en 2 min read 05-10-2024 8
Python : pyright : Self@T is not compatible with T Python Pyright and the Self T is not Compatible with T Error Understanding the Problem Have you ever encountered the cryptic error message Self T is not compati 2 min read 05-10-2024 4
Python list[T] not assignable to list[T | None] Unpacking the Mystery Why Python Cant Assign list T to list T None The Problem You re working with Python lists and trying to assign a list of a specific type l 2 min read 05-10-2024 4
How to make Pylance and Pydantic understand each other when instantiating BaseModel class from external data? Pylance and Pydantic A Love Story of Type Hints and Data Validation Problem When using Pydantics Base Model to structure data Pylance the VS Code Python languag 2 min read 05-10-2024 6
Why does Pylance show error for one function with type hints but not the other? Pylances Picky Preferences Why Type Hints Work for One Function But Not the Other Ever experienced the frustration of Pylance highlighting an error in one funct 2 min read 05-10-2024 6
Typing function object property Typing Function Object Properties A Guide to Clarity and Safety Java Scripts dynamic nature allows us to easily attach functions as properties to objects Howeve 2 min read 05-10-2024 5
How to override inferred type by Pylance using type annotations? Overriding Pylances Inferred Types A Guide to Type Annotations Pythons dynamic nature often leads to flexibility but this can also create confusion when it come 2 min read 05-10-2024 6
Type Hinting Error with Union Types and Type Variables in Python 3.11 Type Hinting Troubles Navigating Union Types and Type Variables in Python 3 11 Python 3 11 introduced powerful new features for type hinting including the abili 3 min read 05-10-2024 5
How to type annotate different return type depending on if a parameter is given like in case of next() function? Mastering Type Annotations with Conditional Return Types An Example with next Type annotations are a powerful tool in Python for improving code readability and 2 min read 04-10-2024 7
Are type vars and type unions incompatible in python? Type Wars Why Type Vars and Type Unions Dont Mix in Python Pythons type system while powerful sometimes presents its own set of challenges One such challenge ar 2 min read 04-10-2024 7
Resolving Type Support Errors in Polars Series Unlocking the Power of Polars Series Resolving Type Support Errors Polars a powerful and efficient data manipulation library in Python leverages the concept of 2 min read 04-10-2024 9
Nested Protocols are not checked by Mypy/Pylance Mypys Blind Spot Why Nested Protocols Dont Get Checked The Problem Mypy a popular static type checker for Python struggles to accurately check nested protocols 2 min read 04-10-2024 4
Type annotation not working in pylance when code is refactored Type Annotations Gone AWOL Why Pylance Cant Keep Up with Your Refactoring Type annotations are a powerful tool in Python for ensuring code correctness and reada 3 min read 04-10-2024 12
Narrow down type-hint of return value to child class if function only hints to parent class Refining Type Hints Narrowing Parent Class Returns to Child Classes in Python The Problem Imagine you have a function that returns an object but you know the ac 2 min read 04-10-2024 4
How to check with mypy that types are *not* compatible Mypy Magic Ensuring Type Incompatibility Mypy the beloved static type checker for Python is renowned for its ability to catch type errors before they cause runt 2 min read 04-10-2024 8