🌱 Junior Track 16 of 16

16. Python Standard Library

Master Python's "Batteries Included" standard library: `os`, `sys`, `pathlib`, `json`, `re`, `collections`, `itertools`, `functools`, `dataclasses`, `enum`, `secrets`, `hashlib`, `sqlite3`, and `typing`.

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🎓 Junior Python Curriculum — Select Module

1️⃣ Fundamentals 2️⃣ Data Types 3️⃣ Operators 4️⃣ Conditionals 5️⃣ Loops 6️⃣ Collections 7️⃣ Comprehensions 8️⃣ Functions 9️⃣ *args & **kwargs 🔟 Scope & Namespaces 1️⃣1️⃣ OOP 1️⃣2️⃣ Exceptions 1️⃣3️⃣ File Handling 1️⃣4️⃣ Modules & Packages 1️⃣5️⃣ Virtual Environments 1️⃣6️⃣ Standard Library 1️⃣7️⃣ Iterators & Iterables 1️⃣8️⃣ Generators 1️⃣9️⃣ Decorators 2️⃣0️⃣ Context Managers 2️⃣1️⃣ Lambda Functions 2️⃣2️⃣ Functional Programming 2️⃣3️⃣ Type Hints 2️⃣4️⃣ Dataclasses 2️⃣5️⃣ Testing 2️⃣6️⃣ Debugging 2️⃣7️⃣ Logging 2️⃣8️⃣ JSON & Data 2️⃣9️⃣ Regular Expressions 3️⃣0️⃣ Databases 
# ==============================================================================
# JUNIOR PYTHON TRACK 16 — PYTHON STANDARD LIBRARY HIGHLIGHTS
# ==============================================================================

import json
import re
import secrets
import hashlib
import uuid
from collections import Counter, defaultdict
from dataclasses import dataclass
from enum import Enum
from functools import lru_cache
from typing import List, Optional, Dict

# 1. dataclasses & enum
class Role(Enum):
    ADMIN = "Admin"
    STUDENT = "Student"

@dataclass
class UserProfile:
    id: str
    username: str
    role: Role

# 2. functools lru_cache
@lru_cache(maxsize=128)
def fibonacci(n: int) -> int:
    if n < 2:
        return n
    return fibonacci(n - 1) + fibonacci(n - 2)

# 3. collections Counter & defaultdict
def analyze_text(text: str) -> Dict[str, int]:
    words = re.findall(r'\w+', text.lower())
    return Counter(words)

# 4. Security & Identifiers (secrets, hashlib, uuid)
def generate_secure_user(name: str) -> UserProfile:
    user_id = str(uuid.uuid4())
    token = secrets.token_hex(16)
    hashed_token = hashlib.sha256(token.encode()).hexdigest()
    return UserProfile(id=user_id, username=name, role=Role.STUDENT)

if __name__ == "__main__":
    user = generate_secure_user("Dilshad")
    print(f"Dataclass Profile: {user}")
    print(f"Fibonacci(35) cached: {fibonacci(35)}")
    print(f"Word Frequencies: {analyze_text('Python is fast and Python is easy')}")
🌱 Junior Track 16 Master Reference

16. Essential Python Standard Library Reference Matrix

📚 24 Core Standard Library Modules

Category Module Primary Purpose & Key Features
OS & System os, sys, pathlib, subprocess, argparse Operating system interface, CLI arguments, object-oriented paths, and shell process execution.
Math & Time datetime, time, math, random, statistics Date/time math, timestamps, high-precision math, random sampling, and statistical metrics.
Data & Text json, csv, re JSON serialization, CSV file reading/writing, and Regular Expression pattern matching.
Structures & Utils collections, itertools, functools Advanced data containers (Counter, defaultdict), fast iterators, and higher-order functions (lru_cache).
Security & DB uuid, secrets, hashlib, sqlite3 UUID generation, cryptographically strong tokens, SHA-256 hashing, and embedded relational DB.
Type System & OOP typing, dataclasses, enum, logging Static type hinting, boilerplate-free data classes, type-safe enumerations, and flexible logging.

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