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Bites 291

Python Virtual Environments

A virtual environment is an isolated Python installation with its own packages, so each project gets the exact dependency versions it needs without conflicting with other projects or the system Python.

Python & FastAPI2 min read

Explain multi-stage Docker builds for Python and builder vs runtime

Tests separation of build-time and runtime concerns. A strong answer contrasts the builder stage (gcc, headers, wheels) with the runtime stage (slim base, copied artifacts, no compiler). Red flag: citing size alone while ignoring security and caching.

Python & FastAPI2 min read

Why are contextvars better than threading.local in async Python?

This tests whether you know async tasks share OS threads, making thread-local storage unsafe for request state. A great answer notes ContextVar is task-local and resets automatically, while threading.local bleeds across concurrent coroutines.

Python & FastAPI2 min read

How do you use a Python class as a FastAPI dependency?

It tests whether you understand FastAPI DI beyond functions and when stateful encapsulation wins. Explain that Depends takes callable classes, centralizing setup and shared state in __init__. Red flag: claiming classes are pure syntactic sugar.

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Bites 291

Python Virtual Environments

Explain multi-stage Docker builds for Python and builder vs runtime

Why are contextvars better than threading.local in async Python?

How do you use a Python class as a FastAPI dependency?

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