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5.3. Tuples and Sequences section should have the explanation of the indirect way of tuple comprehensions #135092

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hyperkai opened this issue Jun 3, 2025 · 3 comments
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5.3. Tuples and Sequences section should have the explanation of the indirect way of tuple comprehensions #135092

hyperkai opened this issue Jun 3, 2025 · 3 comments
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@skirpichev
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docs Documentation in the Doc dir pending The issue will be closed if no feedback is provided

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@hyperkai
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hyperkai commented Jun 3, 2025

5.3. Tuples and Sequences should have the explanation of the indirect way of tuple comprehensions as shown below:

Tuple comprehensions are not supported but if you really want them, do this with tuple() as shown below:

squares = tuple(x**2 for x in range(10))
@hyperkai hyperkai added the docs Documentation in the Doc dir label Jun 3, 2025
@skirpichev
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Tuple comprehensions are not supported but if you really want them, do this with

Tuple docs says you can construct them from iterable, that means support for comprehensions: https://docs.python.org/3/library/stdtypes.html#tuple

Though, I don't see why this should be in the Tutorial. It doesn't mention even the tuple constructor.

@skirpichev skirpichev added the pending The issue will be closed if no feedback is provided label Jun 3, 2025
@rhettinger
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squares = tuple(x**2 for x in range(10))

This is faster: tuple([x**2 for x in range(10)])

Though, I don't see why this should be in the Tutorial. It doesn't mention even the tuple constructor.

I agree.

@skirpichev skirpichev self-assigned this Jun 5, 2025
@skirpichev
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This is faster: tuple([x**2 for x in range(10)])

Interesting, I got ~x2 speedup on my system even for smaller ranges (when PySequence_Tuple() uses _PyTuple_FromArraySteal()).

I'm closing this, based on Raymond's teaching experience.

@skirpichev skirpichev closed this as not planned Won't fix, can't repro, duplicate, stale Jun 6, 2025
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