Python Learning

• LearningpythonBeginner

  Python Variables and Values

  Learn how Python names values and see the program output from an editable example running in your browser.

  ~12 min read Open learning
• LearningpythonIntermediate

  Python Objects, Values, Types, and Identity

  Build the core Python data-model mental model: every value is an object with a type and identity, and learn how equality, mutability, and hashability fit together.

  ~22 min read Open learning
• LearningpythonBeginner

  Python None and NoneType

  Understand Python's None value, what NoneType means, how functions produce None, and how to test for the absence of a value.

  ~12 min read Open learning
• LearningpythonBeginner

  Python Numbers

  Learn Python's built-in number types, everyday arithmetic, and complex numbers, from division and remainders to exponentiation and rounding.

  ~12 min read Open learning
• LearningpythonBeginner

  Python Strings

  Learn Python text: quoting, f-strings, indexing and slicing, the methods worth memorizing, and the immutability that explains all the rest.

  ~15 min read Open learning
• LearningpythonBeginner

  Python Booleans and Conditionals

  Learn how Python decides: comparisons, the and/or/not trio, truthiness, and if, elif, and else branches that read like sentences.

  ~15 min read Open learning
• LearningpythonBeginner

  Python Lists

  Learn the workhorse container: creating lists, indexing and slicing them, growing and shrinking them in place, and reading them with a for loop.

  ~15 min read Open learning
• LearningpythonBeginner

  Python Dictionaries

  Learn the labeled container: storing values under keys, safe lookup with get, adding and removing entries, and walking keys, values, and pairs.

  ~14 min read Open learning
• LearningpythonBeginner

  Python Loops

  Learn repetition the Python way: for loops over sequences and range, while loops over conditions, break and continue, and enumerate for the times position matters.

  ~15 min read Open learning
• LearningpythonBeginner

  Python Functions

  Learn to give code a name: def, parameters and returns, default and keyword arguments, and the scope rules that keep functions honest.

  ~16 min read Open learning
• LearningpythonBeginner

  Python Tuples and Sets

  Learn when to use immutable tuples and unique-value sets, how packing and unpacking work, and how set operations answer membership and collection questions.

  ~16 min read Open learning
• LearningpythonBeginner

  Python range

  Learn Python's range type: half-open numeric sequences, start/stop/step, negative steps, indexing, slicing, membership, and why ranges do not materialize a list.

  ~12 min read Open learning
• LearningpythonBeginner

  Python zip

  Learn Python's zip function: parallel iteration, shortest-input behavior, strict length checking, multiple iterables, and unzipping paired data.

  ~12 min read Open learning
• LearningpythonIntermediate

  Python Iterable Unpacking

  Learn how Python assigns items from an iterable to multiple targets, including starred targets, nested patterns, and clean value swapping.

  ~16 min read Open learning
• LearningpythonBeginner

  Python map and filter

  Learn Python's map and filter built-ins for lazy transformation and selection of iterable values.

  ~12 min read Open learning
• LearningpythonBeginner

  Python Sorting with sorted()

  Learn Python's sorted() function, key functions, reverse ordering, stable sorting, and when to use list.sort() instead.

  ~13 min read Open learning
• LearningpythonBeginner

  Python all(), any(), min(), max(), and sum()

  Learn Python built-in aggregation functions for truth checks, extremes, and totals: all(), any(), min(), max(), and sum().

  ~16 min read Open learning
• LearningpythonBeginner

  Python abs(), divmod(), and pow()

  Learn three core numeric built-ins: abs() for magnitude, divmod() for quotient and remainder together, and pow() for exponentiation and modular arithmetic.

  ~15 min read Open learning
• LearningpythonIntermediate

  Python Recursion

  Learn how Python functions can call themselves, how base and recursive cases work, how values return through nested calls, and when recursion is a good fit.

  ~20 min read Open learning
• LearningpythonBeginner

  Python Modules and Imports

  Learn how Python splits programs into reusable modules, imports names safely, and uses __name__ and python -m to control how code runs.

  ~17 min read Open learning
• LearningpythonIntermediate

  Building Command-Line Programs with argparse

  Define positional arguments, options, flags, validation, help, and subcommands with Python’s argparse module.

  ~24 min read Open learning
• LearningpythonIntermediate

  Building Iterator Pipelines with itertools

  Learn to chain, limit, batch, compare, accumulate, group consecutive values, and combine iterators with itertools.

  ~22 min read Open learning
• LearningpythonIntermediate

  Caching Function Results with functools

  Learn when function-result caching is useful, how functools.cache and lru_cache reuse results, how to inspect or clear a cache, and which functions should not be cached.

  ~18 min read Open learning
• LearningpythonIntermediate

  Command-Line Streams and Exit Status in Python

  Read command-line arguments, handle standard input and output streams, and return meaningful process exit statuses with Python’s sys module.

  ~22 min read Open learning
• LearningpythonIntermediate

  Comparing Files and Directory Trees with filecmp

  Compare file contents and directory trees with filecmp, understand shallow comparisons and caching, and separate mismatches from comparison errors.

  ~40 min read Open learning
• LearningpythonIntermediate

  Configuring Functions and Methods with functools.partial

  Learn how functools.partial configures callable arguments and how functools.partialmethod creates method variants while preserving instance binding.

  ~16 min read Open learning
• LearningpythonIntermediate

  Counting Items with collections.Counter

  Use collections.Counter to tally items, rank frequent values, update counts, and compare multisets.

  ~17 min read Open learning
• LearningpythonIntermediate

  Efficient Directory Scanning with os.scandir()

  Scan directory entries efficiently with os.scandir() and DirEntry, filter types safely, manage the iterator, and understand metadata caching and errors.

  ~35 min read Open learning
• LearningpythonIntermediate

  Environment Variables and Configuration in Python

  Read optional and required environment variables, validate string configuration, parse Boolean flags, and handle sensitive settings responsibly.

  ~22 min read Open learning
• LearningpythonIntermediate

  Grouping Data with collections.defaultdict

  Use defaultdict factories to group values and initialize missing keys while understanding when lookups do and do not create entries.

  ~16 min read Open learning
• LearningpythonIntermediate

  High-Level File Operations with shutil

  Copy files and directory trees, move and remove paths carefully, inspect disk space, and work with archives using Python’s shutil module.

  ~30 min read Open learning
• LearningpythonIntermediate

  Isolating Dependencies with unittest.mock

  Isolate external collaborators with Mock, side_effect, patch, and autospec while keeping the real behavior under test.

  ~30 min read Open learning
• LearningpythonIntermediate

  Issue and Control Warnings with Python's warnings Module

  Warn callers about deprecated or questionable API use, choose warning categories, control filters, and test warning behavior.

  ~20 min read Open learning
• LearningpythonIntermediate

  Logging Events with Python's logging Module

  Record useful runtime events with named loggers, severity levels, handlers, formatters, and exception details.

  ~22 min read Open learning
• LearningpythonIntermediate

  Managing Resources with contextlib.ExitStack

  Manage optional and dynamically selected synchronous or asynchronous resources with ExitStack and AsyncExitStack, cleanup callbacks, acquisition failures, and ownership transfer.

  ~25 min read Open learning
• LearningpythonIntermediate

  Matching Paths and Filenames with glob and fnmatch

  Learn when to use glob to find pathnames and fnmatch to filter names, including recursive searches, hidden entries, case behavior, and literal wildcard characters.

  ~40 min read Open learning
• LearningpythonIntermediate

  Python __init_subclass__ and Class Creation Hooks

  Learn how Python bases can configure, validate, and register subclasses with __init_subclass__.

  ~20 min read Open learning
• LearningpythonAdvanced

  Python __new__ and Object Creation

  Understand how class calls create instances through __new__ before __init__, and learn why __new__ is especially useful for immutable-type subclasses.

  ~22 min read Open learning
• LearningpythonAdvanced

  Python __slots__ and Instance Storage

  Learn how Python __slots__ declares instance attributes, controls dynamic attributes, and changes instance storage.

  ~20 min read Open learning
• LearningpythonIntermediate

  Python Annotations

  Learn annotation syntax, annotated assignment statements, Python 3.14's deferred annotation model, and the basics of runtime annotation introspection.

  ~22 min read Open learning
• LearningpythonIntermediate

  Python Argument Unpacking

  Learn how to unpack iterables and mappings into function calls with * and **, how unpacking differs from collecting arguments, and how Python handles multiple unpackings.

  ~20 min read Open learning
• LearningpythonBeginnerIntermediate

  Python Assert Statements

  Learn how Python's assert statement checks assumptions and raises AssertionError when an expected condition is false, including when assert is appropriate and when explicit error handling is required.

  ~12 min read Open learning
• LearningpythonIntermediate

  Python Assignment Expressions

  Learn how Python assignment expressions use := to bind a name inside a larger expression, when that improves clarity, and where ordinary assignment is the better choice.

  ~18 min read Open learning
• LearningpythonIntermediate

  Python Asynchronous Context Managers

  Learn async with and asynchronous context managers through __aenter__() and __aexit__(), including awaited entry and exit, cleanup, exception handling, and multiple contexts.

  ~25 min read Open learning
• LearningpythonIntermediate

  Python Asynchronous Generators

  Learn asynchronous generator functions, yield, suspended execution, incremental production, explicit aclose(), and deterministic cleanup with contextlib.aclosing() when iteration ends early.

  ~25 min read Open learning
• LearningpythonBeginner

  Python Augmented Assignment

  Learn how +=, -=, *=, and the other augmented-assignment operators combine an operation with assignment, including their target-evaluation and in-place behavior.

  ~18 min read Open learning
• LearningpythonIntermediate

  Python Binary Search with bisect

  Find insertion boundaries in sorted sequences, search safely around duplicates, and insert values or records without re-sorting the whole list.

  ~15 min read Open learning
• LearningpythonBeginner

  Python Bytes and Bytearray

  Learn how Python represents binary data with immutable bytes and mutable bytearray objects, including indexing, slicing, construction, encoding boundaries, and common binary operations.

  ~20 min read Open learning
• LearningpythonAdvanced

  Python Callable Objects and __call__

  Learn how Python instances become callable with __call__, including state, arguments, return values, and inheritance.

  ~22 min read Open learning
• LearningpythonIntermediate

  Python Class Methods and Static Methods

  Learn how Python class methods receive the class, how static methods receive no implicit object, and how to choose between method styles.

  ~22 min read Open learning
• LearningpythonAdvanced

  Python Class Subscription and __class_getitem__

  Learn how Python classes customize square-bracket subscription with __class_getitem__, including generic-style parameterization and the boundary with instance subscription.

  ~24 min read Open learning
• LearningpythonBeginner

  Python Classes and Objects

  Learn how Python classes define objects, instance state, methods, class attributes, inheritance, and basic reuse with super().

  ~25 min read Open learning
• LearningpythonIntermediate

  Python Comprehensions

  Learn how list, set, and dictionary comprehensions build collections from iterables with concise, readable expressions.

  ~20 min read Open learning
• LearningpythonBeginnerIntermediate

  Python Conditional Expressions

  Learn how to choose between two values with Python’s conditional expression, while keeping the expression readable and distinct from a full if statement.

  ~12 min read Open learning
• LearningpythonIntermediate

  Python Copying Objects: Shallow, Deep, and Replace

  Understand assignment versus copying, shallow and deep copies of nested objects, recursive references, and copy.replace() for supported record-like objects.

  ~18 min read Open learning
• LearningpythonIntermediate

  Python Coroutines and async/await

  Understand coroutine functions, coroutine objects, and await, and learn how Python suspends and resumes coroutine execution.

  ~25 min read Open learning
• LearningpythonIntermediate

  Python CSV

  Learn how to read and write tabular CSV data with Python’s csv module.

  ~25 min read Open learning
• LearningpythonAdvanced

  Python Custom Attribute Access

  Learn how Python customizes instance attribute reads, fallback lookup, assignment, and deletion with __getattribute__, __getattr__, __setattr__, and __delattr__.

  ~24 min read Open learning
• LearningpythonAdvanced

  Python Custom isinstance() and issubclass() Checks

  Learn how Python customizes isinstance() and issubclass() through __instancecheck__() and __subclasscheck__() on a metaclass, including virtual relationships and preserving normal inheritance checks.

  ~25 min read Open learning
• LearningpythonAdvanced

  Python Custom Subscription and Container Behavior

  Learn how Python classes customize square-bracket subscription, item assignment, item deletion, reverse iteration, and formal sequence, set, and mapping interfaces.

  ~34 min read Open learning
• LearningpythonIntermediate

  Python Dataclasses

  Use dataclasses to model records with annotated fields, generated methods, safe mutable defaults, post-initialization checks, and controlled immutability.

  ~18 min read Open learning
• LearningpythonIntermediate

  Python Decorators

  Learn function decorators, wrapper behavior, functools.wraps, decorator factories and application order, plus how class decorators transform class bindings.

  ~28 min read Open learning
• LearningpythonIntermediate

  Python del Statements

  Learn how Python's del statement removes name bindings, items, slices, and attributes, and why deleting a binding is not the same as destroying an object.

  ~16 min read Open learning
• LearningpythonAdvanced

  Python Descriptors and __set_name__

  Learn how Python descriptors customize attribute access, assignment, deletion, and class-created attribute metadata.

  ~28 min read Open learning
• LearningpythonIntermediate

  Python Double-Ended Queues with collections.deque

  Use collections.deque for efficient work at both ends, FIFO queues, bounded histories, and rotation without repeating basic list operations.

  ~16 min read Open learning
• LearningpythonIntermediate

  Python Enumerations with enum.Enum

  Learn how to model a fixed set of named choices with Enum, inspect member names and values, look up and iterate over members, and prevent accidental aliases.

  ~15 min read Open learning
• LearningpythonIntermediate

  Python Exception Groups and except*

  Learn how Python groups independent exceptions and handles matching subgroups with except*.

  ~18 min read Open learning
• LearningpythonBeginner

  Python Exceptions and Error Handling

  Learn how Python reports runtime failures, handles specific exceptions, performs cleanup, raises errors deliberately, and defines custom exceptions.

  ~20 min read Open learning
• LearningpythonIntermediate

  Python File I/O

  Learn how to open, read, write, and close files safely with Python file objects.

  ~25 min read Open learning
• LearningpythonIntermediate

  Python Format Specifications

  Learn Python format specifications through format(), including width, alignment, fill, numeric precision, and reusable formatting rules without re-teaching f-strings.

  ~15 min read Open learning
• LearningpythonIntermediate

  Python Function Parameter Kinds

  Learn positional-only, keyword-only, variable positional, and variable keyword parameters and how they shape a function calling contract.

  ~18 min read Open learning
• LearningpythonAdvanced

  Python Generator Control with send(), throw(), and close()

  Learn how send(), throw(), and close() explicitly control a suspended synchronous generator, including sent values, injected exceptions, propagation, and cleanup.

  ~24 min read Open learning
• LearningpythonIntermediate

  Python Generator Expressions

  Learn how generator expressions create generator iterators, how they differ from comprehensions, and when to use them.

  ~20 min read Open learning
• LearningpythonIntermediate

  Python Generators

  Learn how generator functions and generator expressions create iterators, how yield suspends and resumes execution, and when generators are useful.

  ~25 min read Open learning
• LearningpythonAdvanced

  Python Generic Type Parameters

  Learn Python type parameter syntax for generic functions, classes, and type aliases, including type-parameter scope, bounds, defaults, and the roles of TypeVarTuple and ParamSpec.

  ~22 min read Open learning
• LearningpythonIntermediate

  Python Iterators

  Learn how Python iterables and iterators work, how for loops use the iterator protocol, how to build a simple class-based iterator, and how iter(callable, sentinel) reads until a stop value.

  ~25 min read Open learning
• LearningpythonIntermediate

  Python JSON

  Learn how to convert Python data to JSON and back, and how to save structured data in JSON files.

  ~25 min read Open learning
• LearningpythonIntermediate

  Python Lambda Expressions

  Learn how Python lambda expressions create small anonymous functions, where they fit, and when def is clearer.

  ~18 min read Open learning
• LearningpythonAdvanced

  Python Metaclasses and Class Creation

  Understand how Python creates class objects, how metaclasses control that process, and when simpler class hooks are a better choice.

  ~28 min read Open learning
• LearningpythonAdvanced

  Python Module Attribute Access

  Learn how module-level __getattr__ and __dir__ customize missing attribute lookup and module introspection without confusing attribute access with global-name resolution.

  ~18 min read Open learning
• LearningpythonIntermediate

  Python Multiple Inheritance and Method Resolution Order

  Learn how Python combines multiple base classes, resolves inherited attributes with the method resolution order, and uses super() cooperatively across a multiple-inheritance hierarchy.

  ~24 min read Open learning
• LearningpythonBeginner

  Python Names, Scopes, and Namespaces

  Understand how Python binds names, organizes namespaces, resolves names through nested scopes, and uses global and nonlocal when rebinding is intentional.

  ~25 min read Open learning
• LearningpythonBeginnerIntermediate

  Python Operator Precedence and Evaluation Order

  Learn how Python groups operators and evaluates expressions, so you can read complex expressions confidently and add parentheses when they make the meaning clearer.

  ~16 min read Open learning
• LearningpythonBeginner

  Python Packages and Imports

  Learn how Python organizes related modules into packages, how __init__.py participates in regular packages, and how absolute and relative imports connect modules.

  ~18 min read Open learning
• LearningpythonIntermediate

  Python Paths and pathlib

  Learn to build, inspect, search, compare, normalize, expand, split, and convert filesystem paths with pathlib and selected os.path APIs, including directory traversal, path identity, environment-variable expansion, drive/root/tail decomposition, path representations, home expansion, resolution, and relative paths.

  ~44 min read Open learning
• LearningpythonIntermediate

  Python Priority Queues with heapq

  Use the standard heapq module to maintain a min-heap, schedule work by priority, and understand combined push/pop operations.

  ~18 min read Open learning
• LearningpythonIntermediate

  Python Properties and Managed Attributes

  Learn how Python properties manage attributes and when functools.cached_property is useful for reusable per-instance computed values.

  ~26 min read Open learning
• LearningpythonIntermediate

  Python Special Methods and Object Behavior

  Learn how Python classes customize built-in operations with special methods such as __repr__, __str__, __format__, __len__, __bool__, __contains__, __eq__, and __add__.

  ~24 min read Open learning
• LearningpythonIntermediate

  Python Structural Pattern Matching

  Learn Python match statements through literal, capture, sequence, mapping, class, value, wildcard, guard, OR, and AS patterns.

  ~27 min read Open learning
• LearningpythonIntermediate

  Python TOML Configuration

  Learn how to read TOML configuration data with Python's tomllib module.

  ~25 min read Open learning
• LearningpythonIntermediate

  Python Type Alias Statements

  Learn Python's type statement for creating type aliases, using aliases in annotations, and understanding their lazy evaluation without confusing them with the type() function.

  ~15 min read Open learning
• LearningpythonIntermediate

  Python Union Types with |

  Learn how Python combines types with the | union expression, includes None as an allowed type, simplifies equivalent unions, and uses supported unions in runtime instance and subclass checks.

  ~18 min read Open learning
• LearningpythonIntermediate

  Python With Statements and Context Managers

  Learn Python context managers, entry and cleanup, exception propagation, multiple resources, and contextlib.suppress(), nullcontext(), and closing().

  ~24 min read Open learning
• LearningpythonIntermediate

  Python yield from

  Learn how Python's yield from delegates iteration to another iterable, how a delegated generator can return a value, and when delegation makes generator code clearer.

  ~22 min read Open learning
• LearningpythonIntermediate

  Reading Filesystem Metadata with os.stat() and stat

  Read filesystem metadata safely with os.stat(), pathlib stat methods, stat mode helpers, timestamps, and portable error handling.

  ~35 min read Open learning
• LearningpythonIntermediate

  Regular Expressions with Python’s re Module

  Learn regular-expression patterns, matching operations, capture groups, substitutions, splitting, flags, and safe limits with Python’s re module.

  ~30 min read Open learning
• LearningpythonIntermediate

  Running External Programs with subprocess

  Run child processes safely with argument lists, captured streams, exit-code handling, and timeouts using Python's subprocess module.

  ~24 min read Open learning
• LearningpythonIntermediate

  Temporary Files and Directories in Python

  Create secure scratch files and disposable workspaces with tempfile, choose an appropriate interface, and clean up reliably.

  ~25 min read Open learning
• LearningpythonIntermediate

  Testing Asynchronous Python Code with unittest

  Test coroutine-based Python code using IsolatedAsyncioTestCase, async fixtures, reliable cleanup, and await-aware dependency assertions.

  ~25 min read Open learning
• LearningpythonIntermediate

  Testing Docstring Examples with doctest

  Turn concise Python docstring and documentation examples into executable checks with doctest, testmod, testfile, expected exceptions, and unittest integration.

  ~30 min read Open learning
• LearningpythonIntermediate

  Testing Python Code with unittest

  Write focused unit tests with unittest, choose clear assertions, check expected exceptions, isolate fixtures, and discover tests from the command line.

  ~28 min read Open learning
• LearningpythonIntermediate

  Working with Dates and Times

  Use Python's datetime types for dates, clock times, durations, parsing, formatting, and timezone-aware values.

  ~24 min read Open learning
• LearningpythonIntermediate

  Working with TAR Archives Using tarfile

  Create, inspect, read, compress, and cautiously extract TAR archives with Python’s standard-library tarfile module.

  ~40 min read Open learning
• LearningpythonIntermediate

  Working with ZIP Archives Using zipfile

  Create, inspect, update, verify, and selectively extract ZIP archives with Python’s standard-library zipfile module.

  ~35 min read Open learning

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