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GeezerVison is showing github.com — For-else deserves its own section in the tutorial by nedbat · Pull Request #123946 · python/cpython

For-else deserves its own section in the tutorial #123946

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Merged
nedbat merged 3 commits into python:main from nedbat:nedbat/for-else-tutorial
Sep 25, 2024

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For-else deserves its own section in the tutorial #123946

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For-else deserves its own section in the tutorial
nedbat Sep 11, 2024
24be1a9
remove mention of unrolling the loop
nedbat Sep 25, 2024
b42d86c
Update Doc/tutorial/controlflow.rst
nedbat Sep 25, 2024
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remove mention of unrolling the loop
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@nedbat
nedbat committed Sep 25, 2024
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7 changes: 4 additions & 3 deletions 7 Doc/tutorial/controlflow.rst
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Expand Up @@ -237,9 +237,10 @@ which searches for prime numbers::
the ``for`` loop, **not** the ``if`` statement.)

One way to think of the else clause is to imagine it paired with the ``if``
inside the loop. If you conceptually unroll the loop, you have an if/if/if/else
structure. The ``if`` is inside the loop, executing a ``break``, and the
``else`` is the else clause outside the loop.
inside the loop. As the loop executes, it will run a sequence like
if/if/if/else. The ``if`` is inside the loop, encountered a number of times. If
the condition is ever true, a ``break`` will happen. If the condition is never
true, the ``else`` clause outside the loop will execute.

When used with a loop, the ``else`` clause has more in common with the ``else``
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@JelleZijlstra JelleZijlstra Sep 25, 2024

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Is this paragraph necessary? Many readers of the tutorial will not be familiar with try/else, so I'm not sure this helps many people.

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@nedbat nedbat Sep 25, 2024

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I don't expect people to read purely linearly, and this could help cement the semantics in the reader's mind.

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clause of a :keyword:`try` statement than it does with that of ``if``
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