Python Interview Prep

Class-Based Context Managers, contextlib Helpers, Decorator Factories, functools.wraps, Resource Cleanup, Simple Decorators

Background Jobs, Caching, Container And Process Shape, Environment-Based Deployment, Idempotency, Layered Architecture

Import/Export Mini Project, Input Assumptions, Reporting and Auditability, Script Entry Points

Dataclass Basics, Factories, When To Use A Class

Argparse And Commands, Environment Configuration, Runnable Project Shape

Linters And Formatters, mypy Feedback

Dry Runs And Rule Narration, First Mini Project

Abstraction Discipline, Readability Tradeoffs, Review Quality

Mutation and Copying

async def and await, Cancellation, GIL Judgment, Processes For CPU Work, Semaphores, Timeouts, and Cancellation, Task Coordination

Branching Policies, For Loops, Guard Clauses, While Loops and Retries

Aggregation Patterns, Dicts, Lists, Nested Data, Sets, Sorting and Grouping

Basic SQLite Queries, Parameterized Queries, Repository Boundaries, Row Mapping, Transactions

Normalization Pipelines, Safe Output Writes

Logging, Tracebacks and Root Cause

Composition, Instance Methods, Invariants In __post_init__, Mini Domain Model, Properties And Encapsulation

Custom Exceptions, Error Translation, Raising Exceptions, Try and Except

API Errors, Pydantic Models, Route Handlers, Validation

Pathlib, Reading Text

Batch Helpers, Function Extraction, Return Values

429s and Backoff, Authentication, Basic HTTP Clients, JSON Mapping, Pagination and Rate Limits, Timeouts and Retries

Answer Structure, Behavioral Stories, Debugging Stories, Handling Uncertainty, Mock Answer Quality, Performance Interview Answers

Generator Expressions, Iterator Protocol, Yield And Custom Generators

Structured Diagnostics

Long-Lived Objects, Tracing Allocations

Data Structure Choice, Microbenchmarks, Optimization Boundaries, Profiling First, Profiling Stories

Entry Points, Module Boundaries, Package Layout, Project Metadata, Virtual Environments

Built-in Types and None, Expressions and Arithmetic, f-Strings and Output Formatting, Tracing and Code Reading, Variables and Names

Closures and Scope, Dunder Methods, Import System and Caching, Mutability Traps, Properties and Descriptors, Reference Counting and GC

Data Structures • Binary Search Trees, Data Structures • bisect on Sorted Lists, Data Structures • collections.deque for Stacks and Queues, Data Structures • Counter and Frequency Maps, Data Structures • defaultdict for Grouping, Data Structures • Dictionaries and Hash Tables

Dict Comprehensions, Lazy Pipelines, List Comprehensions, Set Comprehensions

Types During Refactors

Failure Policy

Dependency Hygiene, Deserialization Safety, Input Validation, Log Redaction, Safe Subprocess Calls, Secrets Management

CSV Parsing, JSON Parsing

Dependency Injection, DTO Mapping, Integration Client Shape, Repository Boundaries, Service Layer

Indexes And Access Patterns, Joins, Schema Thinking

Choosing The Model

API Contract Testing, Arrange Act Assert, Basic pytest Assertions, Boundary And Failure Tests, Fixtures, Monkeypatching and Mocks

Function Type Hints, Optional And Collections, Protocols, TypedDict And Shaped Data