19.07.13 22:32, Ben Finney написав(ла):
Serhiy Storchaka <storch...@gmail.com> writes:
I'm asking only about this case, when the dash is used to denote a
break in a sentence or to set off parenthetical statements.
That's two separate cases:
* denote a break in a sentence
* set off parenthetical statements
In Wikipedia they considered as one case.
In my experience, an em dash is commonly used for the former, and en
dashes commonly used for the latter. Using the same dash for both is
unusual (and IMO needlessly ambiguous to the reader).
This is definitely should be described in the official guide. I never
heard about this.
Currently Python documentation uses fourth variants:
All your examples are only for parenthetical statements. Can you find
examples of the former, where a break (not parenthetical) in the
sentence is intended?
(2) and (4) are from Wikipedia (which consider it as one case). Here are
real random examples from Python documentation:
1. "Common installation tools such as ``Distribute`` and ``pip`` work as
expected with venvs - i.e. when a venv is active, they install Python
packages into the venv without needing to be told to do so explicitly."
2. "Enter *string* in the table of "interned" strings and return the
interned string which is *string* itself or a copy."
3. "The :class:`set` type is mutable --- the contents can be changed
using methods like :meth:`add` and :meth:`remove`."
4. "Three locking mechanisms are used---dot locking and, if available,
the :c:func:`flock` and :c:func:`lockf` system calls."
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