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:

import array
data = array.array('f')
f = open('FileName.bin', 'rb')
data.fromfile(f, 1000)

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]

cesco schrieb:

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:

import array
data = array.array('f')
f = open('FileName.bin', 'rb')
data.fromfile(f, 1000)

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?

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

Diez

[Peter Hansen]

cesco wrote:

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:

import array
data = array.array('f')
f = open('FileName.bin', 'rb')
data.fromfile(f, 1000)

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?

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