# [Tutor] count numbers only in the string

Joel Goldstick joel.goldstick at gmail.com
Tue Mar 6 21:49:14 CET 2012

```On Tue, Mar 6, 2012 at 3:07 PM, kumar s <ps_python at yahoo.com> wrote:
> Hi :
>
> I have some strings with both alpha-numeric strings. I want to add all the numbers in that string and leave characters and special characters.
> 1A0G19
>
> 5G0C25^C52
>
> 0G2T3T91
> 44^C70
>
> How can I count only the numbers in the above.
>
> 1 A 0 G 19       =    1+0+19 = 20
>
> 5 G 0 C 25 ^C 52  =   5+0+25+52 = 82
>
> 0 G 2 T 3 T 91    =  0+2+3+91 =  96
> 44 ^C 70   =   44+70 =  114
>
>  In first string 1A0G19  I am only adding 1, 0, and 19.    I am not splitting 19 to add 1+9 which will give totally wrong answer for me.
>
>
> Is there a way I can do this.
>
>
> kumar
>
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I am pretty much a novice with regular expressions, but this seems to
work to find all the numeric sequences:

>>> source = 'ab123t&4533www'
>>> re.findall('\d*', source)
['', '', '123', '', '', '4533', '', '', '', '']
>>>
so then something like this:

total = 0
my_list = re.findall('\d*', source)
for my_number in my_list:
if my_number != ''
total += int(my_number)

--
Joel Goldstick
```