No, not at all! Why have a language feature when you’re discouraged from using it? For some things generator syntax is indeed more useful e.g. single inline for or when the runtime is dominated by something else or when you can reuse a generator for multiple things. The example here just doesn’t benefit from one of those cases, but rather the double for generator causes an allocation which dominates the runtime. Additionally, no one in this thread has tested whether that generator function has constant overhead or whether it is in O(n). Just 10 elements in p are surely not representative for the general case.
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