Programming Tutorials and Coding Guides

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.

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.

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 …

Learn what a static method is in Python and how to use @staticmethod. See examples, static method vs class method vs instance method, when to use static methods, and common mistakes.

Learn how to append to a string in Python using +, +=, f-strings, format(), and join(). Understand why Python strings have no append() method and when to use each approach.

Learn how to check if a string contains a substring in Python using the in operator, find(), index(), count(), and regex. See case-sensitive, case-insensitive, multiple substring, whole-word, and pattern matching …

Learn Python string formatting using f-strings, str.format(), and percent formatting. See examples for variables, numbers, decimal precision, padding, alignment, percentages, dates, and %d meaning in Python.

Learn how to replace text in a file using Python. See examples for replacing a string in the same file, writing to a new file, handling large files, using fileinput with backup, and regex replacement with re.sub().

Learn what a tuple is in Python with simple examples. See how to create tuples, access items, use indexing and slicing, unpack tuples, compare tuples with lists, and use tuple methods.

Learn how to check the type of a variable in Python using type() and isinstance(). See when to use each method, how to check multiple types, and how type hints differ from runtime type checking.

Learn what yield means in Python and how it creates generator functions. Understand yield vs return, next(), for loops, generator expressions, yield from, and common mistakes with simple examples.

Learn Python writelines() method with examples. Write a list of strings to a file, add newline characters, append lines, compare write() vs writelines(), and avoid common mistakes.

Learn how to write to a file in Python using with open(). Create a new file, overwrite an existing file, append data, write multiple lines, and avoid common file mode mistakes.

Learn how to use multiple conditions in a Python while loop using and, or, not, parentheses, and two-condition examples. Understand when the loop stops and how to avoid infinite loops.