[Python-ideas] with statement syntax forces ugly line breaks? (original) (raw)

Mark Summerfield mark at qtrac.eu
Thu Sep 9 07:49:51 CEST 2010

Hi Nathan,

On Wed, 8 Sep 2010 13:00:25 -0400 Nathan Schneider <nathan at cmu.edu> wrote:

Mark,

I have approached these cases by using the backslash line-continuation operator: _with FakeContext("a") as a, _ FakeContext("b") as b: pass

Yes, of course, and that's the way I've done it. But it seems a pity to do it this way when the documentation explicitly discourages the use of the backslash for line continuation: http://docs.python.org/py3k/howto/doanddont.html (look at the very last item)

Nathan On Wed, Sep 8, 2010 at 12:50 PM, Mark Summerfield <mark at qtrac.eu> wrote: > Hi, > > I can't see a nice way of splitting a with statement over mulitple > lines: > > class FakeContext: >    def init(self, name): >        self.name = name >    def enter(self): >        print("enter", self.name) >    def exit(self, *args): >        print("exit", self.name) > > with FakeContext("a") as a, FakeContext("b") as b: >    pass # works fine > > > with FakeContext("a") as a, >     FakeContext("b") as b: >    pass # synax error > > > with (FakeContext("a") as a, >      FakeContext("b") as b): >    pass # synax error > > The use case where this mattered to me was this: > >    with open(args.actual, encoding="utf-8") as afh, >    open(args.expected, encoding="utf-8") as efh: actual = >    [line.rstrip("\n\r") for line in afh.readlines()] expected = >    [line.rstrip("\n\r") for line in efh.readlines()] > > Naturally, I could split the line in an ugly place: > >    with open(args.actual, encoding="utf-8") as afh, > open(args.expected, encoding="utf-8") as efh: > > but it seems a shame to do so. Or am I missing something? > > I'm using Python 3.1.2. > > -- > Mark Summerfield, Qtrac Ltd, www.qtrac.eu >    C++, Python, Qt, PyQt - training and consultancy >        "Rapid GUI Programming with Python and Qt" - ISBN 0132354187 >            http://www.qtrac.eu/pyqtbook.html _> ________________________ > Python-ideas mailing list > Python-ideas at python.org > http://mail.python.org/mailman/listinfo/python-ideas >

-- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Programming in Python 3" - ISBN 0321680561 http://www.qtrac.eu/py3book.html

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