On Mon, Apr 23, 2018 at 8:20 AM, Mike Miller <python-...@mgmiller.net> wrote: > > On 2018-04-22 14:33, Chris Angelico wrote: >> >> with open(fn) as f: >> with (open(fn) as f): >> >> These two do the same thing, but only because a file object's >> __enter__ returns self. So it's dangerous, because it WILL work... and >> people will get into the habit of parenthesizing to permit a 'with' >> statement to go across line breaks. And then they'll use a different >> context manager, like closing(), or a PsycoPG2 database connection (I >> think), where it returns something else. And it'll work, until they go >> over multiple lines, and then suddenly the semantics change. > > > > Why do you think folks will be rushing to parenthesize with statements when > it has always been a syntax error, there is years of code and docs that show > otherwise, no use cases, and will take years for 3.8 to trickle out?
Because it's been requested a number of times as a way to allow a 'with' statement to go across lines without backslashes. If it becomes possible, it will be used. ChrisA _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
