In Python, [::-1] means reversing a string, list, or any iterable with an ordering. For example: Output: This is the quick answer. However, reversing a list in Python used to be something I always had to look up as I never wanted to learn how it works. But now that I understand the mechanism, it […]
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Leaving code comments might sometimes help clarify your code. There are 3 unofficial comment types in Python. A “block comment”: An “inline comment”: A “multi-line” comment that misuses a docstring: Commenting Code in Python To add a comment in Python, use the hashtag operator # before starting to type the comment. Before digging into the
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To write a module in Python, all you need to do is create a Python file and write some code for it. For example, to create a module called example, create a file called example.py and add the following function to it: There is your first Python module. To use it, you need to import
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To round numbers in Python, use the built-in round() function. For example, let’s round a floating-point number to its nearest integer value: Output: To round up or down, use the math module’s ceil() or floor() functions: In this guide, you will learn how to: How to Round to 2 Decimals in Python To specify how
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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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Commonly you see the Uncaught TypeError: cannot set property innerText of null error if you try to access an HTML element on a page before it appears. The solution. Move your JavaScript from the head to the body tag below the HTML element you are trying to access. An Example Situation Let’s say you are
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In optimal circumstances, it will take around 500-1000 hours to become a job-ready programmer. If you practice 8 hours a day on 5 days a week, this means 13-26 weeks. But this is a ballpark estimate. Your mileage may vary. Some companies offer apprenticeships where you start from zero and become a programmer in 3-6
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To see where pip installs packages on your system, run the following command: And replace <package_name> with the actual name of the package. Example: NumPy Location For example, let’s see where NumPy is installed: Output: Here you can see that the location field says the package is installed at /usr/local/lib/python3.8/site-packages. The location obviously depends on
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To sort an array of arrays in JavaScript, pass a custom comparison function into the sort() function call. For example, let’s sort an array of arrays based on the second element in ascending order: Result: How Does It Work? To learn how this code works, you need to understand how basic sorting works in JavaScript.
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To comma-separate thousands in a big number in JavaScript, use the built-in toLocaleString() method. It localizes the number to follow a country-specific number formatting. To separate thousands with commas, localize the number to the USA. To do this, pass the ‘en-US’ locale code as an argument to the toLocaleString() method. For example: Output: Alternative Approaches
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