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
Syntax object.__sizeof__(self, other) The Python __sizeof__() method returns the size of the object in bytes. The sys.getsizeof() method internally call’s __sizeof__() and adds some additional byte overhead, e.g., for garbage collection. Basic Example The following code snippet creates a list object x with three integers and measures its size in bytes (104) using the x.__sizeof__() … Read more
“Numbers have an important story to tell. They rely on you to give them a clear and convincing voice.” ― Stephen Few “Visualizations act as a campfire around which we gather to tell stories.” ― Al Shalloway “The goal is to turn data into information and information into insight.” ― Carly Fiorina These quotes are … Read more
Python’s __reversed__ magic method implements the reversed() built-in function that returns a reverse iterator over the values of the given sequence such as a list, a tuple, or a string. Syntax __reversed__(self) Let’s have a look at an example next. Example In the following code, you create a Person class with one name attribute. The … Read more
Syntax and Definition The Python __contains__() magic method implements the membership operation, i.e., the in keyword. Semantically, the method returns True if the argument object exists in the sequence on which it is called, and False otherwise. For example, 3 in [1, 2, 3] returns True as defined by the list method [1, 2, 3].__contains__(3). … Read more
In which order does the nested ternary operator evaluate its conditions? Short Answer: The nested ternary operator ‘1’ if x else ‘2’ if y else ‘3’ evaluates the condition from left to right, i.e., ‘1’ if x else (‘2’ if y else ‘3’). In short, first condition first! Problem Formulation Given a nested ternary operator … Read more
Python es potente: puedes condensar muchos algoritmos en una sola línea de código. Así que surge la pregunta natural: ¿se puede escribir un bucle for en una sola línea de código? Este artículo explora con todo detalle esta cuestión fundamental. ¿Cómo escribir un bucle for en una sola línea de código Python? Hay dos formas … Read more
Showing pictures in Python This post will show different ways of displaying pictures in Python. The options we will explore are: PIL (Python Image Library) OpenCV (Computer Vision Library) IPython Matplotlib Library Method 1: PIL (Python Image Library) PIL is the standard library to manage images in Python. They discontinued the project in 2011, but … Read more
Syntax object.__call__(self[, args…]) The Python __call__ method makes a class callable, so you can call objects of the class like a normal function. For example, if you define __call__(self) on an object x of class X, you can call it like so: x(). The return value of the called object is the return value of … Read more
Syntax object.__repr__(self) The Python __repr__ method returns a string representation of the object on which it is called. It implements the built-in repr() function. If you call print(x) an object x, Python internally calls x.__str__() to determine the string representation of object x. If this isn’t implemented, Python calls x.__repr__(). We call this a “Dunder … Read more
The Pandas DataFrame has several methods concerning Computations and Descriptive Stats. When applied to a DataFrame, these methods evaluate the elements and return the results. Preparation Before any data manipulation can occur, two (2) new libraries will require installation. The Pandas library enables access to/from a DataFrame. The NumPy library supports multi-dimensional arrays and matrices … Read more
💡 Idea: Duck typing is a computer science concept where the type of an object is largely ignored—only the methods the object defines matter. This is sometimes referred to as dynamic typing because the type of an object is determined dynamically at runtime rather than checked by the compiler. Instead of checking the type, the … Read more