decorators module ¶

Class and function decorators.

binary_magic_config Config ¶

Config of binary magic methods to be added to a class.

Config({
    "__eq__": {
        "func": "<ufunc 'equal'>"
    },
    "__ne__": {
        "func": "<ufunc 'not_equal'>"
    },
    "__lt__": {
        "func": "<ufunc 'less'>"
    },
    "__gt__": {
        "func": "<ufunc 'greater'>"
    },
    "__le__": {
        "func": "<ufunc 'less_equal'>"
    },
    "__ge__": {
        "func": "<ufunc 'greater_equal'>"
    },
    "__add__": {
        "func": "<ufunc 'add'>"
    },
    "__sub__": {
        "func": "<ufunc 'subtract'>"
    },
    "__mul__": {
        "func": "<ufunc 'multiply'>"
    },
    "__pow__": {
        "func": "<ufunc 'power'>"
    },
    "__mod__": {
        "func": "<ufunc 'remainder'>"
    },
    "__floordiv__": {
        "func": "<ufunc 'floor_divide'>"
    },
    "__truediv__": {
        "func": "<ufunc 'divide'>"
    },
    "__radd__": {
        "func": "<function <lambda> at 0x1260499e0>"
    },
    "__rsub__": {
        "func": "<function <lambda> at 0x126049a80>"
    },
    "__rmul__": {
        "func": "<function <lambda> at 0x126049b20>"
    },
    "__rpow__": {
        "func": "<function <lambda> at 0x126049bc0>"
    },
    "__rmod__": {
        "func": "<function <lambda> at 0x126049c60>"
    },
    "__rfloordiv__": {
        "func": "<function <lambda> at 0x126049d00>"
    },
    "__rtruediv__": {
        "func": "<function <lambda> at 0x126049da0>"
    },
    "__and__": {
        "func": "<ufunc 'bitwise_and'>"
    },
    "__or__": {
        "func": "<ufunc 'bitwise_or'>"
    },
    "__xor__": {
        "func": "<ufunc 'bitwise_xor'>"
    },
    "__rand__": {
        "func": "<function <lambda> at 0x126049e40>"
    },
    "__ror__": {
        "func": "<function <lambda> at 0x126049ee0>"
    },
    "__rxor__": {
        "func": "<function <lambda> at 0x126049f80>"
    }
})

unary_magic_config Config ¶

Config of unary magic methods to be added to a class.

Config({
    "__neg__": {
        "func": "<ufunc 'negative'>"
    },
    "__pos__": {
        "func": "<ufunc 'positive'>"
    },
    "__abs__": {
        "func": "<ufunc 'absolute'>"
    },
    "__invert__": {
        "func": "<ufunc 'invert'>"
    }
})

attach_binary_magic_methods function ¶

attach_binary_magic_methods(
    translate_func,
    config=None
)

Class decorator to add binary magic methods to a class.

translate_func should

take self, other, and unary function,
perform computation, and
return the result.

config defaults to binary_magic_config and should contain target method names (keys) and dictionaries (values) with the following keys:

func: Function that combines two array-like objects.

attach_unary_magic_methods function ¶

attach_unary_magic_methods(
    translate_func,
    config=None
)

Class decorator to add unary magic methods to a class.

translate_func should

take self and unary function,
perform computation, and
return the result.

config defaults to unary_magic_config and should contain target method names (keys) and dictionaries (values) with the following keys:

func: Function that transforms one array-like object.

cached_method function ¶

cached_method(
    *args,
    maxsize=128,
    typed=False,
    **flags
)

Extends custom_method() with caching.

Internally uses functools.lru_cache.

Disables caching if should_cache() yields False or a non-hashable object as argument has been passed.

See notes on cached_property.

custom_method function ¶

custom_method(
    *args,
    **flags
)

Custom extensible method that stores function and flags as attributes.

Can be called both as

>>> @cached_method
... def user_function(): pass

and

>>> @cached_method(maxsize=128, typed=False, a=0, b=0)  # flags
... def user_function(): pass

should_cache function ¶

should_cache(
    func_name,
    instance,
    func=None,
    **flags
)

Check whether to cache the method/property based on a range of conditions defined under caching in settings.

Each condition has its own rank. A narrower condition has a lower (better) rank than a broader condition. All supplied keys are checked, and if any condition fails, it's assigned to the highest (worst) rank.

Here's the condition ranking:

0) instance and func 1) instance and flags 2) instance 3) cls and func 4) cls and flags 5) cls 6) base_cls and func 7) base_cls and flags 8) base_cls 9) func and flags 10) func 11) flags

This function goes through all conditions of type CacheCondition in whitelist and blacklist and finds the one with the lowest (best) rank. If the search yields the same rank for both lists, global caching flag enabled decides.

Usage

Let's evaluate various caching conditions:

>>> import vectorbt as vbt

>>> class A:
...     @cached_property(my_flag=True)
...     def f(self):
...         return None

>>> class B(A):
...     @cached_property(my_flag=False)
...     def f(self):
...         return None

>>> a = A()
>>> b = B()

>>> vbt.CacheCondition(instance=a, func='f')  # A.f
>>> vbt.CacheCondition(instance=b, func='f')  # B.f
>>> vbt.CacheCondition(instance=a, flags=dict(my_flag=True))  # A.f
>>> vbt.CacheCondition(instance=a, flags=dict(my_flag=False))  # none
>>> vbt.CacheCondition(instance=b, flags=dict(my_flag=False))  # B.f
>>> vbt.CacheCondition(instance=a)  # A.f
>>> vbt.CacheCondition(instance=b)  # B.f
>>> vbt.CacheCondition(cls=A)  # A.f
>>> vbt.CacheCondition(cls=B)  # B.f
>>> vbt.CacheCondition(base_cls=A)  # A.f and B.f
>>> vbt.CacheCondition(base_cls=B)  # B.f
>>> vbt.CacheCondition(base_cls=A, flags=dict(my_flag=False))  # B.f
>>> vbt.CacheCondition(func=A.f)  # A.f
>>> vbt.CacheCondition(func=B.f)  # B.f
>>> vbt.CacheCondition(func='f')  # A.f and B.f
>>> vbt.CacheCondition(func='f', flags=dict(my_flag=False))  # B.f
>>> vbt.CacheCondition(flags=dict(my_flag=True))  # A.f

CacheCondition class ¶

CacheCondition(
    instance=None,
    func=None,
    cls=None,
    base_cls=None,
    flags=None,
    rank=None
)

Caching condition for the use in should_cache().

Superclasses

builtins.tuple

base_cls method-wrapper ¶

Base class of the class or its name (case-sensitive).

cls method-wrapper ¶

Class of the instance or its name (case-sensitive).

flags method-wrapper ¶

Flags to check for in method/property's flags.

func method-wrapper ¶

Method/property or its name (case-sensitive).

instance method-wrapper ¶

Class instance the method/property is bound to.

rank method-wrapper ¶

Rank to override the default rank.

cached_methodT class ¶

cached_methodT(
    *args,
    **kwargs
)

Base class for protocol classes.

Protocol classes are defined as::

class Proto(Protocol):
    def meth(self) -> int:
        ...

Such classes are primarily used with static type checkers that recognize structural subtyping (static duck-typing).

For example::

__ class C__

def meth(self) -> int:
    return 0

def func(x: Proto) -> int: return x.meth()

func(C()) # Passes static type check

See PEP 544 for details. Protocol classes decorated with @typing.runtime_checkable act as simple-minded runtime protocols that check only the presence of given attributes, ignoring their type signatures. Protocol classes can be generic, they are defined as::

class GenProto(Protocol[T]):
    def meth(self) -> T:
        ...

Superclasses

custom_methodT
typing.Generic
typing.Protocol

attrname class variable ¶

clear_cache class variable ¶

lock class variable ¶

maxsize class variable ¶

name class variable ¶

typed class variable ¶

cached_property class ¶

cached_property(
    func,
    **flags
)

Extends custom_property with caching.

Similar to functools.cached_property, but without replacing the original attribute to be able to re-compute whenever needed.

Disables caching if should_cache() yields False.

Cache can be cleared by calling clear_cache with instance as argument.

!!! note: Assumes that the instance (provided as self) won't change. If calculation depends upon object attributes that can be changed, it won't notice the change.

Superclasses

custom_property

attrname property ¶

Get name of cached attribute.

clear_cache method ¶

cached_property.clear_cache(
    instance
)

Clear the cache for this property belonging to instance.

class_or_instanceproperty class ¶

class_or_instanceproperty(
    func
)

Property that binds self to a class if the function is called as class method, otherwise to an instance.

classproperty class ¶

classproperty(
    func
)

Property that can be called on a class.

custom_methodT class ¶

custom_methodT(
    *args,
    **kwargs
)

Base class for protocol classes.

Protocol classes are defined as::

class Proto(Protocol):
    def meth(self) -> int:
        ...

Such classes are primarily used with static type checkers that recognize structural subtyping (static duck-typing).

For example::

__ class C__

def meth(self) -> int:
    return 0

def func(x: Proto) -> int: return x.meth()

func(C()) # Passes static type check

See PEP 544 for details. Protocol classes decorated with @typing.runtime_checkable act as simple-minded runtime protocols that check only the presence of given attributes, ignoring their type signatures. Protocol classes can be generic, they are defined as::

class GenProto(Protocol[T]):
    def meth(self) -> T:
        ...

Superclasses

typing.Generic
typing.Protocol

Subclasses

cached_methodT

flags class variable ¶

func class variable ¶

custom_property class ¶

custom_property(
    func,
    **flags
)

Custom property that stores function and flags as attributes.

Can be called both as

>>> @custom_property
... def user_function(self): pass

and

>>> @custom_property(a=0, b=0)  # flags
... def user_function(self): pass

Note

custom_property instances belong to classes, not class instances. Thus changing the property, for example, by disabling caching, will do the same for each instance of the class where the property has been defined.

Subclasses

cached_property

decorators module¶

binary_magic_config Config¶

unary_magic_config Config¶

attach_binary_magic_methods function¶

attach_unary_magic_methods function¶

cached_method function¶

custom_method function¶

should_cache function¶

CacheCondition class¶

base_cls method-wrapper¶

cls method-wrapper¶

flags method-wrapper¶

func method-wrapper¶

instance method-wrapper¶

rank method-wrapper¶

cached_methodT class¶

attrname class variable¶

clear_cache class variable¶

lock class variable¶

maxsize class variable¶

name class variable¶

typed class variable¶

cached_property class¶

attrname property¶

clear_cache method¶

class_or_instanceproperty class¶

classproperty class¶

custom_methodT class¶

flags class variable¶

func class variable¶

custom_property class¶

decorators module ¶

binary_magic_config Config ¶

unary_magic_config Config ¶

attach_binary_magic_methods function ¶

attach_unary_magic_methods function ¶

cached_method function ¶

custom_method function ¶

should_cache function ¶

CacheCondition class ¶

base_cls method-wrapper ¶

cls method-wrapper ¶

flags method-wrapper ¶

func method-wrapper ¶

instance method-wrapper ¶

rank method-wrapper ¶

cached_methodT class ¶

attrname class variable ¶

clear_cache class variable ¶

lock class variable ¶

maxsize class variable ¶

name class variable ¶

typed class variable ¶

cached_property class ¶

attrname property ¶

clear_cache method ¶

class_or_instanceproperty class ¶

classproperty class ¶

custom_methodT class ¶

flags class variable ¶

func class variable ¶

custom_property class ¶