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Original ticket http://projects.scipy.org/numpy/ticket/1634 on 2010-10-11 by trac user foobaron, assigned to unknown.
aArray = numpy.fromfile(signalfile, numpy.dtype('u1'), number_of_bytes)
signalfile = <StringIO.StringIO instance at 0xa0008ec>1
-->
IOError: first argument must be an open file
used python version: 2.6.5