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I have a text file and the first line provides the best score of a game. This
line has the following format :

Best score : 42

In order to update the score, I try to retrieve the score value.

In C, we would manage this with the following statement :

fscanf(foo_file, "Best score : %d", &score);

Does Python provide an equivalent ?

On Sat, Sep 5, 2009 at 3:13 AM, candide<> wrote:
> I have a text file and the first line provides the best score of a game. This
> line has Â*the following format :
>
> Best score : 42
>
> In order to update the score, I try to retrieve the score value.
>
> In C, we would manage this with the following statement :
>
> fscanf(foo_file, "Best score : %d", &score);
>
> Does Python provide an equivalent ?

Not an exact one, but it's still easily accomplished:

score = int(foo_file.read().split(":").strip())

Cheers,
Chris
--
http://blog.rebertia.com

Chris Rebert wrote:
> On Sat, Sep 5, 2009 at 3:13 AM, candide<> wrote:
>> I have a text file and the first line provides the best score of a game. This
>> line has the following format :
>>
>> Best score : 42
>>
>> In order to update the score, I try to retrieve the score value.
>>
>> In C, we would manage this with the following statement :
>>
>> fscanf(foo_file, "Best score : %d", &score);
>>
>> Does Python provide an equivalent ?
>
> Not an exact one, but it's still easily accomplished:
>
> score = int(foo_file.read().split(":").strip())

One must, of course, select the second item from the list returned by
..split. The .strip() seems not to be needed, at least in 3.1, as int()
ignores whitespace.

>>> s='Best score : 42\n'
>>> int(s.split(':')[1])
42

candide <> wrote:

>In C, we would manage this with the following statement :
>
>fscanf(foo_file, "Best score : %d", &score);
>
>Does Python provide an equivalent ?

RTFM!

In the python 2.5 manual: Chapter 4.2.6 (search pattern 'scanf' on the
index tab of python25.chm)

There are some scanf-patterns with corresponding regular expressions
listed.

Works quite nice.



Best regards,

Günther

On Sat, Sep 5, 2009 at 8:00 AM, Terry Reedy<> wrote:
> Chris Rebert wrote:
>>
>> On Sat, Sep 5, 2009 at 3:13 AM, candide<> wrote:
>>>
>>> I have a text file and the first line provides the best score of a game..
>>> This
>>> line has Â*the following format :
>>>
>>> Best score : 42
>>>
>>> In order to update the score, I try to retrieve the score value.
>>>
>>> In C, we would manage this with the following statement :
>>>
>>> fscanf(foo_file, "Best score : %d", &score);
>>>
>>> Does Python provide an equivalent ?
>>
>> Not an exact one, but it's still easily accomplished:
>>
>> score = int(foo_file.read().split(":").strip())
>
> One must, of course, select the second item from the list returned by
> .split.

(whacks forehead)

One should not answer threads at 3AM local time without
double-checking the solution...

- Chris

Günther Dietrich a écrit :

>
> RTFM!
>
> In the python 2.5 manual: Chapter 4.2.6 (search pattern 'scanf' on the
> index tab of python25.chm)


Correct !! For once the Manual gives an inambiguous answer :

----------------------
Simulating scanf() .-- Python does not currently have an equivalent to scanf().
Regular expressions are generally more powerful, though also more verbose, than
scanf() format strings.
----------------------

I'm realizing that using re module is worthwhile but I never tried to learn it.