[Aahz]
> I'm also opposed to elif in conditional expressions -- let's keep this
a
> simple Pythonic rewrite of C's ternary.
>
> I'm +0 on requiring parentheses precisely because they're annoying.
I'm
> still expecting simple boolean expressions to be the primary use case,
> and my hunch is that overall Python code will read better with the
> ternary looking cluttered.
FWIW, I scanned the standard library for all the and/or pairings where a
conditional expression was applicable. This sampling can serve as a
reference for what "typical" uses would look like in real Python code as
created by a number of different authors.
It only takes about five minutes to try out a given syntax proposal on
all the fragments listed below. That short exercise provides an
excellent insight into the look and feel of each proposal in real world
code.
Raymond
---------------------------------------------------------------------
cgitb.py: file = file and os.path.abspath(file) or '?'
cgitb.py: formatter = (self.format=="html") and html or text
compileal1.py: cfile = fullname + (__debug__ and 'c' or
'o')
csv.py: (quotes[a] > quotes[b]) and a or b,
quotes.keys())
csv.py: (delims[a] > delims[b]) and a or b,
delims.keys())
csv.py: modes[char] = reduce(lambda a, b: a[1] >
b[1] and a or b,
DocXMLRPCServer.py: anchor = (cl and cl.__name__ or '') + '-' +
name
fileinput.py: isfirstline() and "*"
or "", line)
formatter.py: self.writer.send_paragraph((blankline and 1)
or 0)
gettext.py: __builtin__.__dict__['_'] = unicode and
self.ugettext or self.gettext
imaplib.py: l = map(lambda x:'%s: "%s"' % (x[0], x[1][0] and
'" "'.join(x[1]) or ''), l)
imputil.py: _suffix_char = __debug__ and 'c' or 'o'
keyword.py: iptfile = args and args[0] or "Python/graminit.c"
pickle.py: self.write(obj and NEWTRUE or NEWFALSE)
pickle.py: self.write(obj and TRUE or FALSE)
pickletools.py: pos is None and
"<unknown>" or pos,
py_compile.py: cfile = file + (__debug__ and 'c' or 'o')
pydoc.py: return result and re.sub('^ *\n', '', rstrip(result)) or
''
pydoc.py: anchor = (cl and cl.__name__ or '') + '-' + name
pydoc.py: lhs = name and '<strong>%s</strong> = ' % name or ''
pydoc.py: contents = doc and [doc + '\n'] or []
pydoc.py: line = (name and name + ' = ' or '') + repr
pydoc.py: line = (name and self.bold(name) + ' = ' or '') + repr
pydoc.py: host = (sys.platform == 'mac') and '127.0.0.1' or
'localhost'
pydoc.py: font = ('helvetica', sys.platform == 'win32' and 8
or 10)
robotp~1.py: return (self.allowance and "Allow" or
"Disallow")+": "+self.path
telnet~1.py: cmd == DO and 'DO' or 'DONT',
ord(opt))
telnet~1.py: cmd == WILL and 'WILL' or
'WONT', ord(opt))
thread~1.py: n!=1 and "s" or "")
token.py: inFileName = args and args[0] or "Include/token.h"
tokenize.py: yield (parenlev > 0 and NL or NEWLINE,
unittest.py: return doc and doc.split("\n")[0].strip() or None
unittest.py: return doc and doc.split("\n")[0].strip() or None
unittest.py: (run, run != 1 and "s" or "",
timeTaken))
urllib.py: safe_map[c] = (c in safe) and c or ('%%%02X' % i)
urllib2.py: type = file and 'I' or 'D'
xdrlib.py: print pred(x) and 'succeeded' or 'failed',
':', x
xmlrpclib.py: write(value and "1" or "0")
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
http://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
