Meaning
Calls the parent metaclass's __new__ method to create a new class object, passing the metaclass, class name, base classes, and namespace dictionary.
Primary Function
Create a new class object by delegating to the parent metaclass's __new__ method.
Communicative Purpose
Invoke the parent metaclass constructor to instantiate a new class while allowing customization before or after creation.
Função primária
Create a new class object by delegating to the parent metaclass's __new__ method.
Propósito comunicativo
Invoke the parent metaclass constructor to instantiate a new class while allowing customization before or after creation.
Situações de gatilho
When defining a custom metaclass and needing to customize class creation while still delegating to the parent metaclass.
Contextos
Inside a custom metaclass's __new__ method, typically before or after modifying the class dictionary (dct).
Slots de substituição
cls name bases dct
Colocados típicos
- __new__ metaclass class
Substituições comuns
- meta.__new__(cls
- name
- bases
- dct)
Erros comuns
Forgetting to pass the required arguments (cls, name, bases, dct) Using super().__new__(cls) without the required parameters
Similar / contraste
__init__ in a metaclass (initializes after creation) __new__ in a regular class (creates an instance)
Interferências
Confusing __new__ with __init__ in metaclasses Missing arguments leads to TypeError
Família do chunk
- python-metaclass
- super-call
- class-creation
Nuance
The call must match the signature of the parent metaclass's __new__; for the built‑in type metaclass this is (cls, name, bases, dict).
Efeito pragmático
Ensures proper class creation while permitting customization in a metaclass.
Dica de memória
super().__new__(cls, name, bases, dct)
Upgrade path
Advanced metaclass patterns (e.g., implementing __init__ or __prepare__ in custom metaclasses)
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