Sorry, I forgot to include versions info: Python 2.5.5 Numpy Version: 1:1.3.0-3+b1 (actual debian testing)
On Wed, Jun 23, 2010 at 12:46 PM, Ruben Salvador <rsalvador...@gmail.com>wrote: > Hi there, > > I have a .npy file built by succesively adding results from different test > runs of an algorithm. Each time it's run, I save a numpy.array using > numpy.save as follows: > > fn = 'file.npy' > f = open(fn, 'a+b') > np.save(f, arr) > f.close() > > When I try to read the file with the following code, for a file containing > 3 array saves (a is there to show when the error arises): > > f = open(fn, 'rb') > arr = np.load(f) > a = 0 > try: > while True: > print a > a += 1 > arr = np.vstack((arr, np.load(f))) > except EOFError: > pass > f.close() > > I get the following output: > > 0 > 1 > 2 > Traceback (most recent call last): > File "./proc_stat.py", line 32, in <module> > arr = np.vstack((arr, np.load(f))) > File "/usr/lib/python2.5/site-packages/numpy/lib/io.py", line 201, in > load > "Failed to interpret file %s as a pickle" % repr(file) > IOError: Failed to interpret file <open file > '/home/rsalvador/trabajo/research/phd/devel/evowv/retest/avgfit_random_sigma_normal_Flp_20G.npy', > mode 'rb' at 0x174ca08> as a pickle > > Using IOError in the except makes the code work, but this way I am masking > other possible sources of error. > > I have tried with a file containing 3 dumps from numpy.save (this is, 3 > arrays saved). As shown, the error is raised when trying to read a fourth > time (since EOFError is not raised). > > Therefore, is this a bug? Shouldn't EOFError be raised instead of IOError? > Or am I missunderstanding something? If this is not a bug, how can I detect > the EOF to stop reading (I expect a way for this to work without tweaking > the code with saving first in the file the number of dumps done)? > > Thanks in advance! > > -- > Rubén Salvador > PhD student @ Centro de Electrónica Industrial (CEI) > http://www.cei.upm.es > Blog: http://aesatcei.wordpress.com > -- Rubén Salvador PhD student @ Centro de Electrónica Industrial (CEI) http://www.cei.upm.es Blog: http://aesatcei.wordpress.com
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