hi;
I'm translating some PHP scripts to Python and have hit a roadblock
with a for statement. If someone could explain to me how one should
translate the multiple increment, evaluations, etc. in the first line
I would appreciate it deeply ...
for ($y = 0, $x = $cx-$cy-1; $y <= $cy; ++$y,++$x) {
$prd = $q * $y_ar[$y] + $car;
$prd -= ($car = intval($prd / 1E7)) * 1E7;
if ($bar = (($x_ar[$x] -= $prd + $bar) < 0)) $x_ar[$x] += 1E7;
}
thanks,
Davis 6 1555 dm*@machinic.ne t (Davis Marques) writes: I'm translating some PHP scripts to Python and have hit a roadblock with a for statement. If someone could explain to me how one should translate the multiple increment, evaluations, etc. in the first line I would appreciate it deeply ...
for ($y = 0, $x = $cx-$cy-1; $y <= $cy; ++$y,++$x) { $prd = $q * $y_ar[$y] + $car; $prd -= ($car = intval($prd / 1E7)) * 1E7; if ($bar = (($x_ar[$x] -= $prd + $bar) < 0)) $x_ar[$x] += 1E7; }
Python is more verbose than PHP when it comes to stuff like that.
You have to expand things:
x = cx - cy - 1
for y in xrange(cy+1):
prd = q * y_ar[y] + car;
car = intval(prd / 1E7)
prd -= car * 1E7;
x_ar[x] -= prd + bar
bar = (x_ar[x] < 0) # is this REALLY what you wanted?
if bar:
x_ar[x] += 1E7;
x += 1
You can more closely approximate the two parallel loops with the
iterzip function in the new itertools package, but that only works
with the latest Python versions.
I suspect that your if statement was actually supposed to say
if (($bar = ($x_ar[$x] -= $prd + $bar)) < 0) $x_ar[$x] += 1E7;
but I don't know what you're really trying to do.
Haha ... you must be originally a perl coder. Who else writes attricious
code like this
if ($bar = (($x_ar[$x] -= $prd + $bar) < 0))
If I was hiring you, I'd fire you on the spot.
Secondly, here is what I came up with. Not sure what '1E7' is though.
And change 'intval' to 'int' if you want to cast something to an int in
python
x,y = cx-cy-1,0
while y <= cy:
prd = q * y_ar[y] + car - ((car = int(prd / 1E7)) * 1E7);
if (bar = ((x_ar[x] -= prd + bar) < 0)) x_ar[x] += 1E7;
x,y = x+1,y+1
Eli I'm translating some PHP scripts to Python and have hit a roadblock with a for statement. If someone could explain to me how one should translate the multiple increment, evaluations, etc. in the first line I would appreciate it deeply ...
for ($y = 0, $x = $cx-$cy-1; $y <= $cy; ++$y,++$x) { $prd = $q * $y_ar[$y] + $car; $prd -= ($car = intval($prd / 1E7)) * 1E7; if ($bar = (($x_ar[$x] -= $prd + $bar) < 0)) $x_ar[$x] += 1E7; }
thanks,
Davis
Paul Rubin wrote: Python is more verbose than PHP when it comes to stuff like that.
<verbosity.py >
marques = """for ($y = 0, $x = $cx-$cy-1; $y <= $cy; ++$y,++$x) {
$prd = $q * $y_ar[$y] + $car;
$prd -= ($car = intval($prd / 1E7)) * 1E7;
if ($bar = (($x_ar[$x] -= $prd + $bar) < 0)) $x_ar[$x] += 1E7;
}"""
rubin = """x = cx - cy - 1
for y in xrange(cy+1):
prd = q * y_ar[y] + car
car = int(prd / 1E7)
prd -= car * 1E7
x_ar[x] -= prd + bar
bar = x_ar[x] < 0
if bar:
x_ar[x] += 1E7
x += 1"""
if __name__ == "__main__":
print "The ultimate verbosity check :-)"
print "PHP", len(marques), "characters "
print "Python", len(rubin), "characters "
</verbosity.py>
Output:
The ultimate verbosity check :-)
PHP 206 characters
Python 205 characters
Note that I didn't cheat and let
if bar: x_ar[x] += 1E7
spread over two lines, thus deliberately wasting another 8 characters.
Peter
In article <ma************ *************** ***********@pyt hon.org>, Eli Pollak wrote: Haha ... you must be originally a perl coder. Who else writes attricious code like this if ($bar = (($x_ar[$x] -= $prd + $bar) < 0))
I know, I know! C programmers! Right?
--
..:[ dave benjamin (ramenboy) -:- www.ramenfest.com -:- www.3dex.com ]:.
: d r i n k i n g l i f e o u t o f t h e c o n t a i n e r :
On Sat, 10 Jan 2004 20:22:18 +1100, "Eli Pollak" <no**@none.co m>
wrote: Haha ... you must be originally a perl coder. Who else writes attricious code like this if ($bar = (($x_ar[$x] -= $prd + $bar) < 0))
Any C programmer worth his salt. I miss those days. Sort of.
--dang
Dang Griffith <no*****@noemai l4u.com> writes: Haha ... you must be originally a perl coder. Who else writes attricious code like this if ($bar = (($x_ar[$x] -= $prd + $bar) < 0))
Any C programmer worth his salt. I miss those days. Sort of.
But that line almost certainly has the parentheses in the wrong place.
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