[Numpy-discussion] Another question on reading from binary FORTRAN file

Christopher Barker Chris.Barker@noaa....
Mon Mar 9 17:43:15 CDT 2009

> On Mon, 9 Mar 2009 21:45:42 +0100, Mark Bakker wrote:
>> I tried to figure this out from the list, but haven't succeeded yet.
>> I have a simple FORTRAN binary file.
>> It contains:
>> 1 integer
>> 1 float
>> 1 array with 16 numbers (float)
>> How do I read these into Python?

there was a lengthy discussion of reading FORTRAN binary files on this 
list within the last few months -- lots of good info there.

However, this is a pretty simple subset of the problem, so you might 
start with the struct module:


pad = 1
format = "%ixi5ixf%ix16f"%(pad,pad,pad)

num_bytes = struct.calcsize(format)
data = infile.read(struct.calcsize(format))

you will need to play with the pad value (1 or 2), and you may not need 
it between the single values ( I htink this all depends on your FORTRAN 


Christopher Barker, Ph.D.

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