Python Class Creation Runs a Defined Hook Sequence
The order of metaclass selection, namespace preparation, class-body execution, __set_name__, __init_subclass__, and decorators.
Python technical articles
Python articles for working developers
Clear explanations of the details that shape real programs.
Explore Python language behavior, the standard library, concurrency, and object-model details that affect real programs.
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Python __slots__ Changes Instance Storage and Inheritance
How __slots__ creates member descriptors, removes automatic instance dictionaries, and affects subclasses and weak references.
Python Pattern Matching Tests Structure and Binds Names
How match and case handle sequence, mapping, class, capture, value, and guarded patterns in Python 3.10 and later.
Python Closures Resolve Names When Called
Why closures created in loops share late-bound names, plus reliable capture patterns and nonlocal state.
Python super() Follows the MRO, Not the Parent Class
How Python super() advances through the method resolution order and how to design cooperative multiple inheritance.
Python Generators Are Suspended Control Flow
How generator creation, send, throw, close, and yield from cooperate across suspension points.
Asyncio Cancellation Is an Exception-Shaped Request
How task cancellation reaches coroutines, interacts with cleanup, and behaves under gather and TaskGroup.
Descriptors Explain Python's Attribute Lookup
A step-by-step model for data descriptors, instance dictionaries, methods, and attribute fallbacks.
Dataclasses Generate a Value Policy, Not Just Boilerplate
How defaults, equality, ordering, frozen instances, and hashing interact in generated dataclass methods.
Context Managers Encode Unwinding, Not Just Cleanup
How with statements enter, unwind, suppress exceptions, and scale to dynamic resources with ExitStack.
Python Imports Execute a Cached Module Graph
How sys.modules, package initialization, from-import bindings, cycles, and reload shape import behaviour.
Python Protocols Separate Static Shape from Runtime Identity
How structural subtyping, runtime-checkable protocols, generic variance, and explicit implementations fit together.
Python Defaults and Copies Share More State Than Their Syntax Suggests
A practical model for function defaults, shallow copies, nested aliases, and defensive API boundaries.
The GIL Is Not a Thread-Safety Contract
What CPython's interpreter lock does, where it is released, and why shared-state invariants still need synchronization.
Exception Groups Preserve Concurrent Failure Structure
How ExceptionGroup and except-star split, handle, and reassemble multiple errors without flattening context.