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|---|---|
| From | Marko Rauhamaa <marko@pacujo.net> |
| Newsgroups | comp.lang.python |
| Subject | Re: Continuing indentation |
| Date | Fri, 04 Mar 2016 08:28:56 +0200 |
| Organization | A noiseless patient Spider |
| Lines | 107 |
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Steven D'Aprano <steve@pearwood.info>:
> class C:
> def method(self):
> if (result is None
> or self.some_condition()
> or len(some_sequence) > 100
> or some_other_condition
> or page_count < 5
> ):
> do_processing()
>
>
> Looks fine to me.
The class is aptly named "C"; the parentheses give a C-esque feel to the
statement.
Continuation lines abound in the standard lib sources. For example:
========================================================================
difflib.py:
========================================================================
# Extend the best by non-junk elements on each end. In particular,
# "popular" non-junk elements aren't in b2j, which greatly speeds
# the inner loop above, but also means "the best" match so far
# doesn't contain any junk *or* popular non-junk elements.
while besti > alo and bestj > blo and \
not isbjunk(b[bestj-1]) and \
a[besti-1] == b[bestj-1]:
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
while besti+bestsize < ahi and bestj+bestsize < bhi and \
not isbjunk(b[bestj+bestsize]) and \
a[besti+bestsize] == b[bestj+bestsize]:
bestsize += 1
# Now that we have a wholly interesting match (albeit possibly
# empty!), we may as well suck up the matching junk on each
# side of it too. Can't think of a good reason not to, and it
# saves post-processing the (possibly considerable) expense of
# figuring out what to do with it. In the case of an empty
# interesting match, this is clearly the right thing to do,
# because no other kind of match is possible in the regions.
while besti > alo and bestj > blo and \
isbjunk(b[bestj-1]) and \
a[besti-1] == b[bestj-1]:
besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
while besti+bestsize < ahi and bestj+bestsize < bhi and \
isbjunk(b[bestj+bestsize]) and \
a[besti+bestsize] == b[bestj+bestsize]:
bestsize = bestsize + 1
========================================================================
========================================================================
ast.py:
========================================================================
def literal_eval(node_or_string):
"""
Safely evaluate an expression node or a string containing a Python
expression. The string or node provided may only consist of the following
Python literal structures: strings, bytes, numbers, tuples, lists, dicts,
sets, booleans, and None.
"""
if isinstance(node_or_string, str):
node_or_string = parse(node_or_string, mode='eval')
if isinstance(node_or_string, Expression):
node_or_string = node_or_string.body
def _convert(node):
if isinstance(node, (Str, Bytes)):
return node.s
elif isinstance(node, Num):
return node.n
elif isinstance(node, Tuple):
return tuple(map(_convert, node.elts))
elif isinstance(node, List):
return list(map(_convert, node.elts))
elif isinstance(node, Set):
return set(map(_convert, node.elts))
elif isinstance(node, Dict):
return dict((_convert(k), _convert(v)) for k, v
in zip(node.keys, node.values))
elif isinstance(node, NameConstant):
return node.value
elif isinstance(node, UnaryOp) and \
isinstance(node.op, (UAdd, USub)) and \
isinstance(node.operand, (Num, UnaryOp, BinOp)):
operand = _convert(node.operand)
if isinstance(node.op, UAdd):
return + operand
else:
return - operand
elif isinstance(node, BinOp) and \
isinstance(node.op, (Add, Sub)) and \
isinstance(node.right, (Num, UnaryOp, BinOp)) and \
isinstance(node.left, (Num, UnaryOp, BinOp)):
left = _convert(node.left)
right = _convert(node.right)
if isinstance(node.op, Add):
return left + right
else:
return left - right
raise ValueError('malformed node or string: ' + repr(node))
return _convert(node_or_string)
========================================================================
Marko
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Continuing indentation Skip Montanaro <skip.montanaro@gmail.com> - 2016-03-02 14:43 -0600
Re: Continuing indentation Marko Rauhamaa <marko@pacujo.net> - 2016-03-02 22:50 +0200
Re: Continuing indentation Ethan Furman <ethan@stoneleaf.us> - 2016-03-02 14:01 -0800
Re: Continuing indentation Marko Rauhamaa <marko@pacujo.net> - 2016-03-03 00:10 +0200
Re: Continuing indentation Skip Montanaro <skip.montanaro@gmail.com> - 2016-03-02 16:44 -0600
Re: Continuing indentation Ethan Furman <ethan@stoneleaf.us> - 2016-03-02 14:51 -0800
Re: Continuing indentation Ethan Furman <ethan@stoneleaf.us> - 2016-03-02 14:56 -0800
Re: Continuing indentation Chris Angelico <rosuav@gmail.com> - 2016-03-03 10:46 +1100
Re: Continuing indentation Steven D'Aprano <steve@pearwood.info> - 2016-03-03 13:15 +1100
Re: Continuing indentation John Gordon <gordon@panix.com> - 2016-03-03 16:16 +0000
Re: Continuing indentation Marko Rauhamaa <marko@pacujo.net> - 2016-03-03 18:47 +0200
Re: Continuing indentation Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2016-03-03 18:06 +0000
Re: Continuing indentation Marko Rauhamaa <marko@pacujo.net> - 2016-03-03 21:36 +0200
Re: Continuing indentation Steven D'Aprano <steve@pearwood.info> - 2016-03-04 11:13 +1100
Re: Continuing indentation INADA Naoki <songofacandy@gmail.com> - 2016-03-04 09:45 +0900
Re: Continuing indentation Erik <python@lucidity.plus.com> - 2016-03-04 01:06 +0000
Re: Continuing indentation INADA Naoki <songofacandy@gmail.com> - 2016-03-04 10:23 +0900
Re: Continuing indentation Steven D'Aprano <steve@pearwood.info> - 2016-03-04 14:48 +1100
Re: Continuing indentation cl@isbd.net - 2016-03-04 10:12 +0000
Re: Continuing indentation alister <alister.ware@ntlworld.com> - 2016-03-04 14:03 +0000
Re: Continuing indentation Ian Kelly <ian.g.kelly@gmail.com> - 2016-03-04 08:25 -0700
Re: Continuing indentation Ethan Furman <ethan@stoneleaf.us> - 2016-03-04 09:36 -0800
Re: Continuing indentation sohcahtoa82@gmail.com - 2016-03-04 13:14 -0800
Re: Continuing indentation Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-04 21:20 +0000
Re: Continuing indentation Erik <python@lucidity.plus.com> - 2016-03-04 23:31 +0000
Re: Continuing indentation Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-04 23:45 +0000
Re: Continuing indentation Ethan Furman <ethan@stoneleaf.us> - 2016-03-04 15:53 -0800
Re: Continuing indentation Simon Ward <simon+python@bleah.co.uk> - 2016-03-05 00:23 +0000
Re: Continuing indentation sohcahtoa82@gmail.com - 2016-03-04 17:17 -0800
Re: Continuing indentation Ethan Furman <ethan@stoneleaf.us> - 2016-03-04 18:14 -0800
Re: Continuing indentation Ben Finney <ben+python@benfinney.id.au> - 2016-03-05 13:22 +1100
Re: Continuing indentation Tim Chase <python.list@tim.thechases.com> - 2016-03-04 20:49 -0600
Re: Continuing indentation srinivas devaki <mr.eightnoteight@gmail.com> - 2016-03-05 10:25 +0530
Re: Continuing indentation Ben Finney <ben+python@benfinney.id.au> - 2016-03-05 16:10 +1100
Re: Continuing indentation Erik <python@lucidity.plus.com> - 2016-03-05 00:52 +0000
Re: Continuing indentation Ben Finney <ben+python@benfinney.id.au> - 2016-03-05 12:05 +1100
Re: Continuing indentation Erik <python@lucidity.plus.com> - 2016-03-05 01:45 +0000
Re: Continuing indentation Steven D'Aprano <steve@pearwood.info> - 2016-03-05 18:17 +1100
Re: Continuing indentation alister <alister.ware@ntlworld.com> - 2016-03-04 13:59 +0000
Re: Continuing indentation Ben Finney <ben+python@benfinney.id.au> - 2016-03-05 10:41 +1100
Re: Continuing indentation sohcahtoa82@gmail.com - 2016-03-04 16:06 -0800
Re: Continuing indentation Ben Finney <ben+python@benfinney.id.au> - 2016-03-05 11:30 +1100
Re: Continuing indentation Ethan Furman <ethan@stoneleaf.us> - 2016-03-04 17:01 -0800
Re: Continuing indentation Erik <python@lucidity.plus.com> - 2016-03-04 02:24 +0000
Re: Continuing indentation Marko Rauhamaa <marko@pacujo.net> - 2016-03-04 08:28 +0200
Re: Continuing indentation codewizard@gmail.com - 2016-03-02 15:46 -0800
Re: Continuing indentation Chris Angelico <rosuav@gmail.com> - 2016-03-03 10:54 +1100
Re: Continuing indentation Pete Forman <petef4+usenet@gmail.com> - 2016-03-03 00:23 +0000
Re: Continuing indentation Carl Meyer <carl@oddbird.net> - 2016-03-02 17:02 -0700
Re: Continuing indentation Steven D'Aprano <steve@pearwood.info> - 2016-03-03 13:22 +1100
Re: Continuing indentation Ben Finney <ben+python@benfinney.id.au> - 2016-03-03 13:30 +1100
Re: Continuing indentation Chris Angelico <rosuav@gmail.com> - 2016-03-03 13:33 +1100
Re: Continuing indentation Ethan Furman <ethan@stoneleaf.us> - 2016-03-02 18:57 -0800
Re: Continuing indentation Ben Finney <ben+python@benfinney.id.au> - 2016-03-03 11:30 +1100
Re: Continuing indentation cl@isbd.net - 2016-03-03 10:22 +0000
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