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Getting the number of elements in a list is a common operation during software development. In Java - fetching the length of a list is done via the size() method, which accesses the cached length of the list in O(1) lookup time. List<Integer> arrayList = List.of(...
David Landup
Dictionaries in Python are an implementantion of hash tables: a data structure on which data is labeled by a key-value. This data structure is efficient for looking up data by its key, with an expected O(1) lookup time. It is important to keep in mind that dict objects are...
Felipe Antunes
NumPy (oftentimes also written as Numpy) is a linear algebra library, which is the basis for most of the scientific computing done in Python. Most libraries for data science, analysis and machine learning build on top of NumPy as the basis for linear algebra, and also have tight coupling and...
In Java, or even many other languages, you may have run into an error like "index 0 out of bounds for length 0". Especially for beginners, this might seem like a confusing error, given that you know array indexes start at 0. This error actually occurs when your...
Guest Contributor
Decision trees are widely used in machine learning problems. We'll assume you are already familiar with the concept of decision trees and you've just trained your tree based algorithm! Advice: If not, you can read our in-depth guide on "Decision Trees in Python with Scikit-Learn guide". Now, it...
Cássia Sampaio
The string.replace() method is a convenient way of changing an recurring expression inside a string to another expression - in other words, to replace all occurrences of a string within another string. The notation is: modified_string = my_string.replace('text_I_want_to_change', 'new_...
Python dict objects have many useful methods for handling data. One method that is useful for accessing data and converting it to a list of tuples is the dict.items() method. my_data = { "Joe": 1, "Jane" : 2, "Alice" : 3, "Bob" : 4 } print(...
In JavaScript, waiting a specific amount of time before executing a function or piece of code is a common requirement. This can be useful for creating delays, like for periodically making an AJAX request, running animations, or even to simply allowing a certain process to complete before moving on. One...
XOR, short for exclusive OR, is a logical operation that takes two operands and returns a boolean value of True if and only if exactly one of the operands is True. In Python, we can perform the XOR operation on two or more values using a variety of methods/operators,...
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