Latest Articles

Learn how to create a progress bar in Python using print(), carriage return, sys.stdout.flush(), tqdm, progressbar2, and alive-progress. See examples for terminal loops, file processing, downloads, asyncio, and common …

Learn how to print a variable in Python using print(), f-strings, commas, str.format(), and % formatting. See examples for printing strings, numbers, multiple variables, text with variables, and avoiding common TypeError …

Learn how Python sorted() works with examples. Understand the difference between sort() and sorted(), sort lists, tuples, strings, dictionaries, use key functions, reverse=True, lambda, and custom sorting.

Learn how to use the Python struct module to pack and unpack binary data. See examples for struct.pack(), struct.unpack(), struct.calcsize(), byte order, format strings, pack_into(), unpack_from(), and common errors.

Learn how Python try except works with simple examples. See how to catch specific exceptions, handle multiple exceptions, use else and finally, raise exceptions, and avoid common mistakes.

Learn how Python input() works, why it returns a string, how to convert input to int or float, handle non-numeric values, validate user input, take multiple inputs, and use input with asyncio.

Learn how to generate UUIDs in Python using the built-in uuid module. See examples of uuid4(), uuid1(), uuid3(), uuid5(), GUIDs, short UUIDs, UUID strings, hex values, and when to use each version.

Learn how to sort a Python list in reverse alphabetical order using sort(reverse=True) and sorted(reverse=True). Also see how to solve the short_names exercise and choose between in-place sorting and creating a new list.

Learn how Python strip() works with examples. Remove leading and trailing whitespace, strip specific characters, compare strip(), lstrip(), and rstrip(), and avoid common mistakes with prefixes and suffixes.

Remove Python 3.14 or 3.15 on Ubuntu 22.04 and 24.04 safely: uninstall Deadsnakes packages, delete source altinstall files, clean pyenv versions and venvs, and keep Ubuntu system python3 working.

Learn simple linear regression in Python using pandas, scikit-learn, and matplotlib. Train a model, make predictions, evaluate accuracy, plot the regression line, and save predictions to a CSV file.

Learn how to shuffle a NumPy array using np.random.shuffle(), Generator.shuffle(), and permutation(). Also see how to shuffle two arrays or lists together in the same random order.

Learn how to create a Seaborn scatter plot using sns.scatterplot(). See examples with hue, style, size, palette, marker size, transparency, labels, legends, and regression lines.

Learn how to remove a key from a Python dictionary using pop(), del, dictionary comprehension, and safe methods to avoid KeyError when the key may not exist.

Learn how the Python zip() function works with lists, tuples, dictionaries, and loops. See how to handle different lengths with strict=True and zip_longest().

Learn the Python zipfile module with examples. Create and append ZIP archives, list and read members, extract files safely, handle passwords on read, choose compression, use BytesIO, and rebuild archives without a …

Learn how to sort a dictionary by key in Python using sorted(), dict(), lambda, itemgetter(), reverse=True, case-insensitive sorting, and nested dictionary examples.

Linux rm has no built-in undo and does not use Trash by default, but you can sometimes recover deleted files—stop writes to the disk first, then try backups, open file handles via /proc, carving tools like Foremost and …

We walk you through Kubernetes DNS failures with the CoreDNS and kube-dns checks we use in real incidents—NXDOMAIN, SERVFAIL, ndots, NetworkPolicy port 53, and external DNS—so you can copy the same commands on your …

Learn how to get and check substrings in Python using slicing, the in operator, find(), index(), count(), and replace(). See extraction before or after a character and common mistakes.

Learn how Python super() works with inheritance. See how to use super().__init__() in child classes, call parent methods, understand MRO, and avoid common multiple inheritance mistakes.

Learn symmetric difference in Python using set.symmetric_difference() and the ^ operator. See examples, difference vs symmetric difference, multiple sets, lists, tuples, and common mistakes.

Learn how to write switch case logic in Python using match case, if-elif statements, and dictionary mapping. See Python switch statement examples, default cases, multiple cases, and when to use each approach.

Learn how the Python ternary operator works using value_if_true if condition else value_if_false. See simple examples, nested ternary expressions, list comprehension usage, and common mistakes.

Learn tree data structure in Python with simple examples. Understand nodes, root, children, binary trees, binary search trees, DFS, BFS, inorder, preorder, and postorder traversal.

Learn how to sort a dictionary by value in Python using sorted(), lambda, itemgetter(), reverse=True, and custom sorting. See examples for ascending order, descending order, duplicate values, and nested dictionaries.

Learn how to sort a list in Python using list.sort() and sorted(). See examples for ascending order, descending order, strings, numbers, custom key functions, list of lists, tuples, dictionaries, None values, and common …

Learn how to split a string in Python using str.split(). See examples for splitting by whitespace, comma, newline, multiple spaces, maxsplit, rsplit(), splitlines(), and regex delimiters.

Learn how Python startswith() works with simple examples. Check if a string starts with a prefix, use start and end positions, match multiple prefixes with a tuple, and perform case-insensitive startswith checks.

Learn Python sets with simple examples. See how to create a set, add and remove items, check membership, remove duplicates, and use union, intersection, difference, symmetric difference, issubset, issuperset, and …