To concatenate two arrays with NumPy: For instance: Output: This is a quick answer. To learn more ways to concatenate arrays and about their efficiency, please, stick around. 4 Ways to Concatenate 1D NumPy Arrays There are four built-in ways to concatenate arrays in NumPy. Before introducing these, it is important you understand that all […]
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To check if two NumPy arrays A and B are equal: For example: This is the easiest approach to comparing two arrays. But this approach is not 100% reliable. Instead, you should consider using the built-in np.array_equal() function for good measure. This always produces the right result. In this guide, you learn how to compare
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To resize an image using OpenCV, use the cv2.resize() function. To do this: Read an image into your program. Specify a scaling factor. Multiply the width and the height by the scaling factor. Call cv2.resize() function with the new dimensions Here is a quick cheat sheet for resizing images in four ways: Next, let’s take
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In Python, slicing is used to access specific parts of an iterable, such as a list. Here are some examples: But how does the slicing notation work? There are two syntaxes you can use the slice notation in Python: Let’s take a look at how both of these work. [start:stop] The slicing notation [start:stop] means
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In Python, there are 7 arithmetic operators you can use to perform basic mathematical operations. Here is a table of all the arithmetic operators in Python with examples: Operator Name Use + Addition x + y – Subtraction x – y * Multiplication x * y / Division x / y % Modulus x %
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In Python, a FIFO queue is a linear data structure. It stores objects in a first in first out (FIFO) manner. For example, you can use the Queue class from the queue module as a thread-safe FIFO queue: Output: However, you could use a regular list as a FIFO queue as well. In this guide,
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In Python, you can use the in operator to check if a value exists in a group of values. For example: Similarly, you can check if a value is not in a collection with not in operation (combining the not operator and the in operator): The ‘in’ Operator in Python The in operator works with
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Regression testing is an essential aspect of software development, ensuring that new code changes do not adversely impact existing functionalities. When developers introduce new features or bug fixes, there is a possibility that these changes may unintentionally disrupt how the existing system operates. To mitigate this risk, teams employ regression testing to confirm that the
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In Python, the built-in list() function converts an iterable object, such as string or tuple, to a list. For example, let’s convert a string to a list of characters: In this guide, you are going to see examples of using the list() function and how to make a custom object support it. When Use list()
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A linter is an automated tool that enforces common style guidelines and best practices. It is every developer’s best friend. If you are not using one, you are missing out. Linters are not a Python-only thing. They are commonly used in any software development project regardless of the language. This is all it takes to
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