Re: how to improve this simple block of code
On Wed, 11 Jan 2006 05:58:05 -0800, py wrote: Say I have... x = 132.00 but I'd like to display it to be 132 ...dropping the trailing zeros...I currently try this Mucking about with the string is one solution. Here is another: print int(float(x)) I do it like this because if x = 132.15 ...i dont want to modify it. But if x = 132.60 ...I want it to become 132.6 Then you want: x = float(123.60) # full precision floating point value r = round(x, 1) # rounded to one decimal place -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
On 11/01/06, Mike Meyer [EMAIL PROTECTED] wrote: py [EMAIL PROTECTED] writes: Say I have... x = 132.00 but I'd like to display it to be 132 ...dropping the trailing zeros...I currently try this Is it likely that x might not have any decimal places? If so all the above solutions fail when x =130 except Matt Hammond's offering which splits x at the decimal point if one exists. -- http://mail.python.org/mailman/listinfo/python-list
how to improve this simple block of code
Say I have... x = 132.00 but I'd like to display it to be 132 ...dropping the trailing zeros...I currently try this if x.endswith(0): x = x[:len(x)-1] if x.endswith(0): x = x[:len(x)-1] if x.endswith(.): x = x[:len(x)-1] I do it like this because if x = 132.15 ...i dont want to modify it. But if x = 132.60 ...I want it to become 132.6 is there a better way to do this? It seems a bit ugly to me. T.I.A (thanks in advance) -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
py wrote:
Say I have...
x = 132.00
but I'd like to display it to be 132 ...dropping the trailing
zeros...I currently try this
if x.endswith(0):
x = x[:len(x)-1]
if x.endswith(0):
x = x[:len(x)-1]
if x.endswith(.):
x = x[:len(x)-1]
I do it like this because if
x = 132.15 ...i dont want to modify it. But if
x = 132.60 ...I want it to become 132.6
is there a better way to do this? It seems a bit ugly to me.
T.I.A
(thanks in advance)
x = x.rstrip('0') # removes trailing zeros
x = x.rstrip('.') # removes trailing dot(s)
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Re: how to improve this simple block of code
hanz wrote:
x = x.rstrip('0.') # removes trailing zeroes and dots
knew there had to be a way, thanks.
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Re: how to improve this simple block of code
On Wed, 11 Jan 2006 13:58:05 -, py [EMAIL PROTECTED] wrote: Say I have... x = 132.00 but I'd like to display it to be 132 ...dropping the trailing zeros... How about: if . in x: x, frac = x.split(.) frac = frac.rstrip(0) if frac: x = x + . + frac Copes if x = 132 too. If there'll always be a decimal point, then you can leave off the initial if. Matt -- | Matt Hammond | RD Engineer, BBC Research Development, Tadworth, Surrey, UK. | http://kamaelia.sf.net/ | http://www.bbc.co.uk/rd/ -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
py [EMAIL PROTECTED] writes: Say I have... x = 132.00 but I'd like to display it to be 132 ...dropping the trailing zeros...I currently try this The two-strip solution is cleaner, but: if x.endswith(0): x = x[:len(x)-1] x = x[:-1] or del x[-1] both improve that one statement. mike -- Mike Meyer [EMAIL PROTECTED] http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
Mike Meyer wrote: py [EMAIL PROTECTED] writes: Say I have... x = 132.00 but I'd like to display it to be 132 ...dropping the trailing zeros...I currently try this The two-strip solution is cleaner, but: if x.endswith(0): x = x[:len(x)-1] x = x[:-1] or del x[-1] both improve that one statement. del it's tempting not to try[-1] Traceback (most recent call last): File stdin, line 1, in ? TypeError: object doesn't support item deletion Just-pointing-out-what-does-not-work-ly yours Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
py wrote:
x = 132.15 ...i dont want to modify it. But if
x = 132.60 ...I want it to become 132.6
is there a better way to do this? It seems a bit ugly to me.
The following works as long as you don't mind losing leading zeros
as well:
x = x.strip('0')
Gary Duzan
Motorola CHS
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Re: how to improve this simple block of code
How about: if . in x: x, frac = x.split(.) frac = frac.rstrip(0) if frac: x = x + . + frac Or simpler still: if . in x: x = x.rstrip(0) x = x.rstrip(.) More concise, but slightly less readable IMO: if . in x: x = x.rstrip(0).rstrip(.) -- | Matt Hammond | RD Engineer, BBC Research Development, Tadworth, Surrey, UK. | http://kamaelia.sf.net/ | http://www.bbc.co.uk/rd/ -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
py wrote:
hanz wrote:
x = x.rstrip('0.') # removes trailing zeroes and dots
knew there had to be a way, thanks.
But that's not it. :-)
This is a wonderful opportunity for you to learn about unit testing, and
begin the long process of developing good testing habits. Of all the
ideas posted, I believe only Mark Hammond's would correctly pass the
basic obvious test cases, and I don't think anyone (without actually
having checked with tests) should be saying even his is clearly correct.
import unittest
from yourmodule import stripZeros # or whatever you have
class Tests(unittest.TestCase):
def test01(self):
'check zero-stripper'
for input, expected in [
('', ''),
('0', '0'),
('0.0', '0'),
('0.', '0'),
('000.', '000'),
('10', '10'),
('10.0', '10'),
('foo', 'foo'),
('foo.', 'foo'), # ??
('132.15', '132.15'),
('132.60', '132.6'),
('132.00', '132'),
('132.0', '132'),
('132.01', '132.01'),
# add others to taste
]:
self.assertEquals(expected, stripZeros(input))
unittest.main()
Change the above test cases to match what you really want if they're not
correct, then run the script and make sure everything passes.
-Peter
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Re: how to improve this simple block of code
Peter Hansen wrote: Of all the ideas posted, I believe only Mark Hammond's would correctly pass the basic obvious test cases Too bad he didn't post at all :-) Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
Peter Otten wrote: Peter Hansen wrote: Of all the ideas posted, I believe only Mark Hammond's would correctly pass the basic obvious test cases Too bad he didn't post at all :-) D'oh! There was a typo in my message above. Naturally, I meant to write M. Hammond instead of Mark Hammond. ;-) Sorry Matt! -Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
py wrote: Say I have... x = 132.00 but I'd like to display it to be 132 ...dropping the trailing zeros... print '%g' % (float(x),) might work. Mel. -- http://mail.python.org/mailman/listinfo/python-list
RE: how to improve this simple block of code
How 'bout: X = 132.00; Y = int(float(X)); Ron Griswold Character TD R!OT Pictures [EMAIL PROTECTED] -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mel Wilson Sent: Wednesday, January 11, 2006 1:08 PM To: python-list@python.org Subject: Re: how to improve this simple block of code py wrote: Say I have... x = 132.00 but I'd like to display it to be 132 ...dropping the trailing zeros... print '%g' % (float(x),) might work. Mel. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
Mel Wilson wrote: py wrote: Say I have... x = 132.00 but I'd like to display it to be 132 ...dropping the trailing zeros... print '%g' % (float(x),) might work. Mel. The input is a string, %g expects a float, TypeError exception. -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
Forget about the previous mail, i just saw you were converting the string to float beforehand, in which case he would more than likely run into the good ol' float imprecision issue sooner than later. Not to mention that %g formats to scientific notation (e.g. exponential format with the exponent always being a multiple of 3), he'd probably use %f. -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code
Ron Griswold wrote: How 'bout: X = 132.00; Y = int(float(X)); This fails on anything that isn't already an integer (in the math sense, not the Python type sense), such as 132.15 which was one of the OP's actual examples. Matt's answer is still the only one that passes the tests. Mel's is correct provided the OP's input data is limited in several ways, which it may well be. (For example, the '%g' approach fails if the input has too many decimal places, such as 132.0001 or 1234567. It also can't handle non-numbers or empty input, though the OP may not care about any of these cases.) All this goes to show there are a *lot* of ways to write code that doesn't work, but apparently only one way to be sure it works. -- Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: how to improve this simple block of code (str.partition?)
Peter Hansen schrieb:
Matt's answer is still the only one that passes the tests.
well, here's another one:
-
def mysplit(s, sep):
x = s.rsplit(sep, 1)
return x + ['']*(2-len(x))
def stripZeros(x):
intpart, frac = mysplit(x, '.')
frac = frac.rstrip('0')
if frac:
return intpart+'.'+frac
else:
return intpart
-
i only mention this one, because i just remembered the discussion
about a str.partition method, which could save this version the
extra function. what happened to that method?
for anyone interested, it was proposed here:
http://mail.python.org/pipermail/python-dev/2005-August/055764.html
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