reading float from binary data file

[cesco]

Hi,

I have a binary file containing 1000 floating point numbers. I want to
load that file into an array. A way to do it could be the following:
[color=blue][color=green][color=darkred]
>>> import array
>>> data = array.array('f' )
>>> f = open('FileName. bin', 'rb')
>>> data.fromfile(f , 1000)[/color][/color][/color]

Now I have the following problem: if I don't know how many values the
file contains and I want to read all the values till the last one what
shall I do?

Thanks & regards
Francesco

[Diez B. Roggisch]

Re: reading float from binary data file

cesco schrieb:[color=blue]
> Hi,
>
> I have a binary file containing 1000 floating point numbers. I want to
> load that file into an array. A way to do it could be the following:
>[color=green][color=darkred]
>>>> import array
>>>> data = array.array('f' )
>>>> f = open('FileName. bin', 'rb')
>>>> data.fromfile(f , 1000)[/color][/color]
>
> Now I have the following problem: if I don't know how many values the
> file contains and I want to read all the values till the last one what
> shall I do?[/color]

Divide the length of the file by the size of one float and use that as
argument to fromfile.

Diez

[Peter Hansen]

Re: reading float from binary data file

cesco wrote:[color=blue]
> I have a binary file containing 1000 floating point numbers. I want to
> load that file into an array. A way to do it could be the following:
>[color=green][color=darkred]
>>>>import array
>>>>data = array.array('f' )
>>>>f = open('FileName. bin', 'rb')
>>>>data.fromfi le(f, 1000)[/color][/color]
>
> Now I have the following problem: if I don't know how many values the
> file contains and I want to read all the values till the last one what
> shall I do?[/color]

Maybe RTFM, and then wrap the .fromfile() call with an appropriate
exception handler:

'''
fromfile(f, n)
Read n items (as machine values) from the file object f and append
them to the end of the array.

If less than n items are available, EOFError is raised, but the items
that were available are still inserted into the array.
'''

Note the last sentence above.

-Peter