[Tutor] Changing only intergers in a list of strings

[David Palao]

Sorry, there is a typo:
"(num+a,)" should be "(num+1,)", obviously.

2014-02-05 David Palao <dpalao.python at gmail.com>:
> Hi,
> Is it not clear to me if you must distinguish ints from other type of
> numbers, or if, for instances floats and ints must be dealt
> differently.
> Anyway, I would propose something like the following function:
>
> def FindNumbers(a_string):
>     print "You entered:", a_string
>     out_list = []
>     for item in a_string.split():
>         try:
>             num = int(item)
>         except ValueError:
>             out_list.append(item)
>         else:
>             out_list.append("%s" % (num+a,))
>         out_string = ' '.join(out_list)
>         # do whatever you want to do with the resulting out_string:
> return it, or display it...
>
> Some comments:
> 1) I would pass the input string as argument rather than using it as a global.
> 2) You could use float instead of int to make it more general
> 3) If you need to distinguish between ints and floats, then you must
> add a couple of extra lines
>
> I hope it helps.
>
> Best
>
>
> 2014-02-04 Colin Struthers <303cookiemonster at gmail.com>:
>> I am in a beginning python course and am working through some code and I
>> can't even figure out how to start building this particular section of code.
>>
>> My goal is to get a sentence for the user and to take each number in the
>> user string and add 1 to each number. i.e "the 4 people had 6 dogs" would
>> change to "the 5 people had 7 dogs"
>>
>> a_string = [ ]
>> int_list = [ ]
>> a_string = raw_input("Enter a sentence with both words and numbers: ")
>>
>> def FindNumbers():
>>     print "You entered: ", a_string
>>     for ints in a_string
>>         ...?
>>
>> FindNumbers()
>>
>> I fully understand that this doesn't even begin to work but I don't really
>> know where to start deconstructing the list, editing only the intergers, and
>> joining it all back together.
>>
>> Thanks for the help.
>>
>> --
>> Colin
>>
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