Re: A question about string and float number

[Timothy Grant]

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@gmail. comwrote:

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@gmail. comwrote:

>>
>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@link line.comwrote:

>>>
>>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]