[Numpy-discussion] tofile problems
Thu Jul 29 18:40:03 CDT 2010
On 07/28/2010 11:32 PM, Christopher Barker wrote:
> Paul Probert wrote:
>> I'm trying to write numpy arrays as binary data, to support a legacy
>> file format. So I open a file and write to it:
>> fp = open('somefile','w')
>> oldpos = fp.tell()
>> newpos = fp.tell()
>> diff = newpos - oldpos - somenumpyarray.nbytes
>> if diff != 0:
>> print 'ahhah! mismatch=',diff
>> I'm observing that every once in while I get 'ahhah! mismatch=1', that
>> is, the file position is advanced by one more byte than x.nbytes would give.
>> I'm using 1.4.1 on windows, python 2.5.
>> Any ideas?
> yup -- you need to open your file as binary:
> fp = open('somefile','wb')
> python is adding a carriage return when it sees a newline, to conform to
> windows text file conventions.
That was it Chris. Thanks much.
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