Python Intermediate

What is Generator?

A function that yields values one at a time using the yield keyword, enabling memory-efficient iteration over large datasets.

Generators produce values lazily — they compute the next value only when requested. This makes them ideal for processing large files, infinite sequences, or data streams without loading everything into memory.

A generator function uses yield instead of return. Generator expressions use parentheses: (x**2 for x in range(1000000)) creates a generator without allocating memory for all values.

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