A question about string and float number

[Wei Guo]

Hi Grant,

I am using the try/exception and just curious why function type doesn't
work.

Best regards,

Wei


On 8/7/08, Timothy Grant <timothy.grant at gmail.com> wrote:
>
> That's because s IS a string. It's not been converted to a float.
>
> In [1]: s = '3.1415'
> In [2]: n = float(s)
> In [3]: type(s)
> Out[3]: <type 'str'>
> In [4]: type(n)
> Out[4]: <type 'float'>
>
> Why are you avoiding the very simple try:/except: solution to this problem?
>
> On Thu, Aug 7, 2008 at 1:28 PM, Wei Guo <weiguo6 at gmail.com> wrote:
> > Hi I tried the first type method but it seens that it doesn't work. Could
> > anyone help me about it?
> >
> >>>> s = '3.145'
> >>>> type(s) == type(float())
> > False
> >>>> type(s)
> > <type 'str'>
> >>>> type(float())
> > <type 'float'>
> >>>>
> >
> > Best regards,
> >
> > Wei
> >
> >
> > On 8/7/08, Wei Guo <weiguo6 at gmail.com> wrote:
> >>
> >> Hi Thanks for Tyler and Edwin's help.
> >>
> >> For my questions, I need to import some xml file and there are floating
> >> number and strings in it. I need to process string and number
> differently.
> >> This is reason that I am asking question here. Is this background
> >> information we need for this quesions.
> >>
> >> Btw, which way is better? type or with exception ValueError?
> >>
> >> Thanks,
> >>
> >> Wei
> >>
> >>
> >> On 8/6/08, Tyler Breisacher <dancinguy at linkline.com> wrote:
> >>>
> >>> It's generally a bad idea to use "except" without naming a specific
> >>> exception. The exception you might expect in this case is ValueError.
> Any
> >>> other exception *should* be uncaught if it happens. By the way, this
> method
> >>> will return true for integers as well as floats. For example,
> isFloat('3')
> >>> will return 3.0. So make sure this is what you want, since it wasn't
> 100%
> >>> clear from the original message.
> >>>
> >>>
> >>> Wei Guo wrote:
> >>>>
> >>>> #this is a better way of testing a string for float
> >>>> def isFloat(s):
> >>>>    try:
> >>>>        s = float(s)
> >>>>    except:
> >>>>        return False
> >>>>    return True
> >>>
> >>>
> >>> --
> >>> http://mail.python.org/mailman/listinfo/python-list
> >>
> >
> >
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
>
>
> --
> Stand Fast,
> tjg.  [Timothy Grant]
>
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