21. File I/O, Serialization (JSON, Pickle) & Pathlib Architecture • Python 0-to-Hero Mastery (Big Tech SDE & ML Standard) • Rishabh Ki Kaksha

Python 0-to-Hero Mastery (Big Tech SDE & ML Standard) › 21. File I/O, Serialization (JSON, Pickle) & Pathlib Architecture

40 mins

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Course Syllabus

Module 1: Python Foundations & Virtual Machine Architecture

01. What is Python? History, CPython Architecture & PVM 02. Memory Management, Reference Counting & The GIL 03. Datatypes Deep Dive: Mutable vs Immutable & Integer Interning Cache 04. Dynamic Typing, Duck Typing & Python 3.12 Strict Type Hinting

Module 2: Flow Control, Collections & Functional Mastery

05. Variables, Scope & The LEGB Rule (Local, Enclosing, Global, Built-in) 06. Comprehensions & The Walrus Operator (:=) for High Performance 07. First-Class Functions, *args, **kwargs & Functional Combinators 08. Advanced Closures, Function Decorators & @functools.wraps

Module 3: Generators, Iterators & Memory-Safe Stream Processing

09. The Iterator Protocol (__iter__, __next__) & Generator Functions 10. Generator Pipelines & Infinite Stream Processing with itertools 11. Context Managers: The "with" Statement & contextlib.contextmanager

Module 4: Object-Oriented Python, Dunder Magic & Metaprogramming

15. Python Descriptors (__get__, __set__) & @property Deep Dive 16. Metaclasses: How Classes are Created (__new__ vs __init__) 12. Classes, Instances, Class Attributes & @classmethod vs @staticmethod 13. Dunder / Magic Methods Masterclass (__repr__, __call__, __getitem__) 14. Multiple Inheritance, MRO & C3 Linearization Algorithm (super())

Module 5: Concurrency, Multithreading & Asynchronous Programming

17. Concurrency Overview: CPU-Bound vs I/O-Bound Bottlenecks 18. Multithreading & ThreadPoolExecutor for High-Throughput I/O 19. Multiprocessing & ProcessPoolExecutor for CPU-Intensive Workloads 20. asyncio Event Loop Masterclass: Coroutines, Tasks & asyncio.gather

Module 6: Production Engineering, Testing & Performance Profiling

21. File I/O, Serialization (JSON, Pickle) & Pathlib Architecture 22. Robust Exception Hierarchies (try/except/else/finally) 23. Performance & Memory Profiling (cProfile, timeit & tracemalloc) 24. Production Package Architecture: pyproject.toml & Virtual Envs

Interactive Lesson Studio

# 21. File I/O, Serialization (JSON, Pickle) & Pathlib Architecture

> Python 0-to-Hero Notes by Rishabh - Topic 21

---

### 1. Object-Oriented Filesystem with `pathlib.Path` 📁

Modern replacement for legacy `os.path`:

```python
from pathlib import Path

data_dir = Path("storage") / "logs" / "2026"
data_dir.mkdir(parents=True, exist_ok=True)

log_file = data_dir / "app.log"
log_file.write_text("🚀 Application Booted Successfully\n", encoding="utf-8")
```

---

### 2. Serialization: JSON vs Pickle vs msgpack 📦

*   **`json`:** Universal, human-readable, safe cross-language standard.
*   **`pickle`:** Python-specific binary serialization (Dangerous! Can execute arbitrary malicious code via `__reduce__`).
*   **`msgpack` / `protobuf`:** High-performance binary JSON format for microservices.

---

### 3. Interview Ke 3 Sawal Is Topic Se

1. **Pickle deserialization (`pickle.loads()`) untrusted data par security vulnerability kyu hai?** -> Attacker malicious pickle payload me `os.system('rm -rf /')` inject karke remote code execution (RCE) trigger kar sakta hai.
2. **`orjson` / `ujson` standard `json` module se 10x faster kyu hain?** -> Rust/C optimized serialization with direct UTF-8 byte stream manipulation.
3. **Memory-mapped files (`mmap` module) large binary files read karte waqt kya optimize karte hain?** -> File ko direct virtual memory address space me map karke kernel space se user space buffer copying eliminate karna.

---
**Next Topic:** 22. Robust Exception Hierarchies (try/except/else/finally)

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1 Questions

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1. Pathlib Directory Walker

`pathlib.Path` ka use karke directory ke files ko safely traverse karein.

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• Use Path.resolve() and Path.glob().

Python 3.12

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🎯 Big Tech Coding & Interview Challenges

1. Pathlib Directory Walker

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CERTIFICATE OF COMPLETION

Rishabh Gehlot

PHP 8+ & Laravel 11 Master Track