Python Built-in Functions

Cómo arreglar “ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() o a.all()”

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Si ejecutas el siguiente código, experimentarás un ValueError especial: El resultado será este mensaje de error: Solución: Usar las funciones de Numpy llamadas logical_and() y logical_or() en lugar de los operadores lógicos de Python (“and” y “or”). Domina los fundamentos y únete al curso “Funciones integradas de Python” aquí: https://academy.finxter.com/university/python-built-in-functions-every-python-coder-must-know/ ¿Por qué se produce el … Read more

Python __getitem__() Magic Method

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Python’s magic method __getitem__(self, key) to evaluate the expression self[key]. So, if you call my_obj[key], Python will call my_obj.__getitem__(key). We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all dunder methods with explanation, check out our dunder cheat sheet article on this blog. Syntax and … Read more

Python __setitem__() Magic Method

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Python’s magic method __setitem__(self, key, value) implements the assignment operation to self[key]. So, if you call self[key] = value, Python will call self.__setitem__(key, value). We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all dunder methods with explanation, check out our dunder cheat sheet article … Read more

Python __delitem__() Magic Method

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Python’s magic method __delitem__(self, key) implements the deletion of self[key]. So, if you call del self[key], Python will call self.__delitem__(key). We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all dunder methods with explanation, check out our dunder cheat sheet article on this blog. Syntax … Read more

Python __getattr__() Magic Method

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Python’s magic method __getattr__() implements the built-in getattr() function that returns the value associated with a given attribute name. Additionally, __getattr__() is called if the normal attribute access (e.g., my_object.my_attribute) results in an AttributeError. We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all dunder … Read more

Python __setattr__() Magic Method

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Python’s magic method __setattr__() implements the built-in setattr() function that takes an object and an attribute name as arguments and removes the attribute from the object. We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all dunder methods with explanation, check out our dunder cheat … Read more

Python __delattr__() Magic Method

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Python’s magic method __delattr__() implements the built-in delattr() function that takes an object and an attribute name as arguments and removes the attribute from the object. We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all dunder methods with explanation, check out our dunder cheat … Read more

Python __missing__() Magic Method

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Syntax object.__missing__(self, key) The __missing__(self, key) method defines the behavior of a dictionary subclass if you access a non-existent key. More specifically, Python’s __getitem__() dictionary method internally calls the __missing__() method if the key doesn’t exist. The return value of __missing__() is the value to be returned when trying to access a non-existent key. We … Read more

Python __import__() Magic Method

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🛑 Overriding this function is strongly discouraged. To change the semantics of the import statement, use import hooks instead! Still here? 😉 So, let’s get started learning the syntax of this function. You can also check out our in-depth article on the __import__ statement here. Syntax __import__(name, globals=None, locals=None, fromlist=(), level=0) Parameter Description name Import … Read more

Python __instancecheck__() Magic Method

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Syntax class.__instancecheck__(self, instance) Python’s class.__instancecheck__(self, instance) method implements the isinstance(instance, class) built-in function. It should return True if instance is a direct or indirect instantiated object of class (e.g., via Python inheritance). We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all dunder methods with … Read more

Python __subclasscheck__() Magic Method

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Syntax class.__subclasscheck__(self, subclass) Python’s class.__subclasscheck__(self, subclass) method implements the issubclass(subclass, class) built-in function. It should return True if subclass is a direct or indirect subclass of class using Python inheritance to define the subclass relationship. We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all … Read more