Brian Skinn <[email protected]> added the comment:
I suppose one alternative solution might be to tweak the ELLIPSIS feature of
doctest, such that it would interpret a run of >=3 periods in a row (matching
regex pattern of "[.]{3,}") as 'ellipsis'.
The regex for PS2 could then have a negative lookahead added, so that it *only*
matches three periods, plus optionally other content: '\.\.\.(?!\.)'
That way, a line like "... foo" would retain the current meaning of "'source'
line, consisting of PS2 plus the identifier 'foo'", but the meaning of
"arbitrary content followed by ' foo'" could be achieved by ".... foo", since
the leading "...." would NOT match the negative lookahead for PS2.
In other situations, where "..." is *not* the leading non-whitespace content,
the old behavior suffices: the PS2 regex won't match anyways, so it'll be left
for ELLIPSIS to process.
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<https://bugs.python.org/issue36714>
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