Generator expressions in Python let you create generators using list comprehension syntax but with parentheses instead of square brackets. They are more concise than defining generator functions, save memory through lazy evaluation, and are especially clean when passing values directly into functions like sum(). However, they are single-use and become hard to read with complex logic, making traditional generator functions preferable for reusable or complex cases. Memory savings don't necessarily mean faster execution, as yielding values one by one can be slightly slower than materializing a list.
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