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Python Programming Interview Questions & Answers

Decorators, generators, memory management, GIL, OOP in Python, and data libraries.

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When should Python code use threads, processes, or asyncio?

Threads often suit blocking I/O when libraries expose synchronous APIs. asyncio suits large numbers of cooperating I/O operations when the libraries are asynchronous; blocking work still blocks the ev...

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How would you make a file-processing script recover safely after interruption?

Process input in identifiable batches and record a checkpoint only after the corresponding output is durable. Write replacement files to a temporary file on the same filesystem, flush as required, and...

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How does a generator help process a large file without loading it all into memory?

A generator yields values lazily and retains enough state to resume on the next iteration. Iterating over an open text file and yielding matching lines avoids building a list of every line. Memory sti...

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What is the difference between a shallow copy and a deep copy of a nested list?

A shallow copy creates a new outer collection but keeps references to its existing elements. If those elements are lists, modifying an inner list through either outer collection affects the same inner...

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