asyncqlio.meta

Useful metamagic classes, such as async ABCs.

Functions

make_proxy(name)	Makes a proxy object for magic methods.
proxy_to_getattr(*magic_methods)	Proxies a method to to __getattr__ when it would not be normally proxied.
typeproperty(func)	Marks a function as a type property.

Classes

AsyncABC
AsyncABCMeta(name, bases, methods)	Metaclass that gives all of the features of an abstract base class, but additionally enforces coroutine correctness on subclasses.
AsyncInstanceType(name, bases, methods)	Metaclass that allows for asynchronous instance initialization and the __init__() method to be defined as a coroutine.
AsyncObject
TypeProperty(fget)	A property on a type.

asyncqlio.meta.make_proxy(name)

Makes a proxy object for magic methods.

asyncqlio.meta.proxy_to_getattr(*magic_methods)

Proxies a method to to __getattr__ when it would not be normally proxied.

This is used for magic methods that are slot loaded (__setattr__ etc.)

Parameters:magic_methods (str) – The magic methods to proxy to getattr.

class asyncqlio.meta.TypeProperty(fget)

Bases: object

A property on a type.

Parameters:fget – The function to call on getting the property.

asyncqlio.meta.typeproperty(func)

Marks a function as a type property.

Return type:TypeProperty

class asyncqlio.meta.AsyncABCMeta(name, bases, methods)

Bases: abc.ABCMeta

Metaclass that gives all of the features of an abstract base class, but additionally enforces coroutine correctness on subclasses. If any method is defined as a coroutine in a parent, it must also be defined as a coroutine in any child.

mro() → list

return a type’s method resolution order

register(subclass)

Register a virtual subclass of an ABC.

Returns the subclass, to allow usage as a class decorator.

class asyncqlio.meta.AsyncInstanceType(name, bases, methods)

Bases: asyncqlio.meta.AsyncABCMeta

Metaclass that allows for asynchronous instance initialization and the __init__() method to be defined as a coroutine.

class Spam(metaclass=AsyncInstanceType):
    async def __init__(self, x, y):
        self.x = x
        self.y = y

async def main():
     s = await Spam(2, 3)
     ...

mro() → list

return a type’s method resolution order

register(subclass)

Register a virtual subclass of an ABC.

Returns the subclass, to allow usage as a class decorator.