Python Multiprocessing Example: Process, Pool, and Queue
Learn Python multiprocessing with practical examples using Process, Pool, pool.map(), Queue, join(), CPU-bound tasks, shared data, and common multiprocessing mistakes.
Go Channels Tutorial: Send, Receive, Close, Range, and Select
Learn channels in Go, including send and receive syntax, buffered and unbuffered channels, close, range, select, deadlocks, and common concurrency patterns.
Golang exec Command: Run Shell Commands, Capture Output, and Handle Errors
Learn how to run external commands in Go using os/exec, capture stdout and stderr, pass arguments, use shell commands, set timeouts, and avoid command injection.
Python map() Function with Examples
Learn Python map() function with examples using custom functions, lambda, built-in functions, multiple iterables, string conversion, list conversion, and map vs list comprehension.
Loop Through Two Lists in Python
Learn how to loop through two or more lists in Python using zip(), enumerate(), range(), indexes, nested loops, and zip_longest() for lists with different lengths.
Python Loop N Times: Repeat Code Using range()
Learn how to loop N times in Python using for range(), repeat code 5 or 10 times, loop without an index, use while loops, and avoid common off-by-one mistakes.
Python List pop() Method: Remove and Return Items
Learn how Python list pop() removes and returns items by index, defaults to the last item, handles pop(0), raises IndexError, and compares with remove(), del, and clear().
Get File Extension in Python: pathlib, os.path, and edge cases
Learn how to get a file extension in Python using pathlib (suffix, suffixes), os.path.splitext, case-insensitive checks, multi-part names like .tar.gz, and common pitfalls.
Install a Python Package from GitHub with pip: branches, tags, SSH, and requirements.txt
Install Python packages from GitHub using pip: PEP 508 git URLs, branches, tags, commits, editable installs, requirements.txt, private repos over HTTPS or SSH, subdirectory packages, verification, upgrades, and common …
Python List with Examples
Learn Python lists with simple examples to create a list, access items, change values, add and remove elements, loop through lists, sort, copy, and use common list methods.
Python Line Continuation: Continue Code on the Next Line
Learn how Python line continuation works using parentheses, brackets, braces, and backslash, with examples for long expressions, strings, lists, function calls, and common errors.
FAISS Python API Tutorial: IndexFlatL2, IndexIVFFlat, add, search, and remove_ids
Practical FAISS Python API guide: install faiss-cpu, NumPy float32 shapes, IndexFlatL2 and IndexFlatIP, add and search, IndexIVFFlat training and nprobe, IndexIDMap and remove_ids, save/load indexes, common dtype and …
Python Measure Execution Time: time, perf_counter, and timeit
Learn how to measure execution time in Python using time.perf_counter(), timeit, process_time(), and decorators, with examples in seconds, milliseconds, and nanoseconds.
Golang Struct Embedding: Composition, Promoted Fields, and Methods
Golang struct embedding and go struct embedding: anonymous embedded fields, promoted fields and methods per the Go spec, composition vs inheritance, pointer embedding, name conflicts, interface embedding, satisfying …
Python Marshmallow Tutorial: Schema, Fields, dump(), and load()
Learn Python Marshmallow with examples for creating schemas, using fields, serializing data with dump(), deserializing and validating data with load(), nested schemas, many=True, DateTime formatting, and common errors.
Golang Pointers Tutorial: Address, Dereference, nil, and Pointer Receivers
Learn pointers in Go: pointer types *T, address operator &, dereferencing, nil pointers, passing pointers to functions, pointer receivers, structs, slices and maps, and when not to use pointers.
Implement a Binary Search Tree in Python: insert, search, delete, traverse
Build a BST in Python with a Node class, iterative insert and search, inorder preorder postorder traversals, delete for leaf one-child and two-child nodes, duplicate policy, complexity, and common pitfalls.
Nested Dictionary in Python: Create, Access, Update, and Loop
Learn nested dictionaries in Python with examples to create, access, update, add, delete, loop through, flatten, and merge dictionary inside dictionary data.
Python Lambda & Anonymous Functions: Syntax, Examples, map(), filter(), sorted()
Learn Python lambda functions (anonymous functions): syntax, examples with multiple arguments, map(), filter(), sorted(), conditional expressions, limits, common mistakes, and when to use def instead.
Combine Two Arrays as Columns in NumPy: column_stack, hstack, and concatenate
Combine two lists or 1-D NumPy arrays into a two-column 2-D array using numpy.column_stack, with numpy.stack axis=1, numpy.hstack for column-shaped inputs, numpy.concatenate axis=1, row vs column stacking, shape rules …
Create Simple & Complex Python Package with Examples
This guide will lead you on how to create a Python package which includes setup, configuration, building and publishing. You will learn how to include more files, test locally and version control for successful …
Python any() and all() Functions: Check If Any or All Items Are True
Learn how Python any() and all() work with lists, strings, dictionaries, truthy and falsy values, generator expressions, short-circuiting, and common mistakes.
Golang Interface Tutorial: Examples, Implementation, and Type Assertion
Learn interfaces in Go with simple examples, including method sets, implicit implementation, interface parameters, empty interface, any, type assertion, printing interface values, composition, pointer receivers, and …
pip requirements.txt File: Create, Install, and Use with pip
Learn how to use a pip requirements.txt file to install Python dependencies with pip install -r, create the file manually or with pip freeze, add version constraints, and fix common errors.
Python Add to Dictionary: Add Key-Value Pairs, Update, and Append
Learn how to add to a dictionary in Python using key assignment, update(), setdefault(), |=, and dictionary unpacking, with examples for single keys, multiple keys, lists, nested dictionaries, and existing keys.
Merge Dictionaries in Python: |, update(), **, and More
Learn how to merge dictionaries in Python using the | operator, update(), ** unpacking, copy(), ChainMap, and more, with duplicate key behavior and Python version differences.
FileNotFoundError in Python: Causes, Fixes, and Path Examples
Learn what FileNotFoundError (No such file or directory, errno 2) means in Python, why it happens even when the file seems to exist, and how to fix it with correct paths, working directory, pathlib, symlinks, and …
Golang Kill Process by PID: Process.Kill, Signal, and CommandContext
Terminate processes from Go by PID or child PID: os.Process and os.FindProcess, Process.Kill vs Process.Signal (SIGTERM vs SIGKILL), stopping commands started with os/exec, timeouts with exec.CommandContext, graceful …
How to Concatenate Tensors in PyTorch: torch.cat, stack, and shapes
Learn how to concatenate tensors in PyTorch with torch.cat along dim 0 or 1, torch.concat and torch.concatenate aliases, shape rules, stack vs cat, device errors, and a quick reference table.
strconv in Go: parse, format, quote, and common errors
strconv in Go: parse and format integers, floats, and bools, Quote and Unquote, bases with FormatUint and ParseInt, NumError with errors.Is, and when to prefer strconv over fmt.Sscanf.