Python Code Typing

Decorators

The @ symbol on functions, methods, and classes

F-Strings & Format Specs

Braces, conversions, and alignment inside f-strings

Annotations & Arrows

The -> and : punctuation of modern type hints

Unpacking & Slicing

Stars, slices, and the walrus operator

Checkpoint: Symbol Fluency

Every Python glyph cluster from this module in one longer drill

Keywords

Python reserved words grouped by role

Declarations

Constants, annotated variables, functions, and dataclasses

Iteration Idioms

enumerate, zip, any, all, and sorted with keys

Generators & yield

yield, yield from, and lazy pipelines

Typing & Protocols

Protocol, TypeVar, and union aliases in daily use

Idiomatic One-Liners

Comprehensions, f-strings, and the walrus operator

Checkpoint: Keywords & Idioms

A lazy sensor pipeline mixing this module's material

Control Flow

if/elif/else, loops, and match statements

Functions & Methods

Default args, star args, context managers, and async def

Context Managers

with blocks and @contextmanager wrappers

Exceptions & Cleanup

A custom exception hierarchy with try/except/else/finally

Counter & defaultdict

Tallying with collections instead of hand-rolled dicts

Match Statements

Structural pattern matching over dataclasses and dicts

Realistic Snippet

Parse a CSV, rank by revenue, and pretty-print the result

Checkpoint: Real Snippets

Dataclasses, pathlib, and grouping in one pass

Speed Run: Retry Decorator

A backoff wrapper typed end to end without stopping

Speed Run: Argparse CLI

A small command-line tool at full pace

Speed Run: CSV Report

DictReader into a formatted revenue table

Speed Run: Async Fan-Out

asyncio.gather over a batch of requests

Speed Run: Pytest Module

Fixtures, parametrize, and raises without pausing

Checkpoint: Sustained Speed

A regex log dashboard typed in one continuous run

Assessment Sim 1: Task Store

A complete JSON-backed task tracker

Assessment Sim 2: RPN Calculator

A full stack evaluator with real error paths

Assessment Sim 3: Inventory Ledger

A dataclass ledger that refuses to oversell

Assessment Sim 4: Latency Report

A log parser that ranks the slowest endpoints

Checkpoint: Python Mastery Final

A ranked sales summary -- the course's graded final