01Module 07 - File Handling and OS Interaction OverviewEverything Python engineers need to master file I/O, the OS module, environment variables, pathlib, CSV/JSON handling, and serialization - the skills you use every single day in production.02Reading Files - open(), Modes, Encodings, and BufferingMaster file reading in Python at engineering depth - understand open() parameters, text vs binary mode, UTF-8 encodings, buffered I/O internals, and strategies for reading 10GB log files without running out of memory.03↳ Practice: Reading FilesSolve 11 Python reading files problems. Covers open function, file reading, readline readlines. Hints and solutions.04Writing Files - Modes, Atomicity, and Safe File UpdatesMaster file writing in Python at engineering depth - understand write modes, flush vs fsync, atomic write patterns, temporary files, and how to update files safely without risking data loss or corruption.05↳ Practice: Writing FilesSolve 11 Python writing files coding problems (4 Easy, 4 Medium, 3 Hard). Covers write file, file modes, writelines practice. Full hints and solutions included.06Context Managers - The with Statement and Resource ManagementMaster Python context managers at engineering depth - understand __enter__ and __exit__ protocols, write your own context managers with classes and @contextmanager, and use contextlib tools for real-world resource management.07↳ Practice: Context Managers<PracticePageHeader08pathlib - Modern Path Manipulation in PythonMaster pathlib at engineering depth - learn why Path objects replace os.path strings, how the / operator composes paths, all path attributes and methods, globbing for batch processing, and cross-platform path handling with PurePath.09↳ Practice: Pathlib Deep DiveSolve 11 Python pathlib deep dive problems. Covers pathlib practice, Path object, glob rglob. Hints and solutions.10The os module - system calls and process interactionMaster Python's os module at engineering depth - how it wraps POSIX and Win32 system calls, when to use os vs pathlib vs shutil, directory traversal with os.walk, file permissions, process IDs, environment variables, and why you should never use os.system.11↳ Practice: OS ModuleSolve 11 Python os module problems. Covers os.path exercises, os.walk practice, os.makedirs python. Hints and solutions.12Environment variables - configuring Python applications at runtimeMaster environment variables at engineering depth - how OS-level key-value pairs are inherited by child processes, how to read and set them with os.environ, the 12-factor app pattern, python-dotenv for development, type coercion pitfalls, and production-grade configuration with Pydantic Settings.13↳ Practice: Environment VariablesSolve 11 Python environment variables problems. Covers os.environ exercises, os.getenv python, dotenv practice. Hints and solutions.14CSV handling - reading and writing tabular dataMaster Python's csv module at engineering depth - how csv.reader, csv.writer, csv.DictReader, and csv.DictWriter work, dialects and quoting modes, encoding issues with Excel BOM, sniffing unknown formats, streaming large files, and when to reach for pandas instead.15↳ Practice: CSV HandlingSolve 11 Python csv handling problems. Covers csv practice, csv.reader exercises, csv.writer practice. Hints and solutions.16JSON Handling - Serialization, Deserialization, and Edge CasesMaster JSON in Python at engineering depth - json.dumps/loads, custom encoders and decoders, non-serializable types, ensure_ascii, compact separators, and high-performance alternatives like orjson.17↳ Practice: JSON HandlingSolve 11 Python json handling problems. Covers json practice, json.dumps json.loads, custom json. Hints and solutions.18Serialization Concepts - pickle, dataclasses, and Format TradeoffsUnderstand Python serialization at engineering depth - pickle protocols and security risks, dataclasses with asdict, Pydantic for API validation, struct for binary protocols, and how to choose the right format for every use case.19↳ Practice: Serialization ConceptsSolve 11 Python serialization concepts problems. Covers pickle practice, shelve module, serialization practice. Hints and solutions.20Working with Directories - Navigation, Traversal, and File OperationsMaster directory operations in Python at engineering depth - os.makedirs vs pathlib.mkdir, os.walk vs Path.rglob, shutil copy/move/delete, temporary directories, disk usage, and real-world project scaffolding and dataset management patterns.21↳ Practice: Working with DirectoriesSolve 11 Python working with directories problems. Covers directory operations, os.makedirs practice. Hints and solutions.22Module 7 - Projects5 lessons5 lessons
