numpy.load does not release file handle for npz files (Trac #1517)

[thouis]

Original ticket http://projects.scipy.org/numpy/ticket/1517 on 2010-06-22 by trac user etecman, assigned to unknown.

When opening a npz file with numpy.load, the handle to the file is not released such that the file cannot be deleted during the runtime of the script - even if all returned values are deleted.

Error message:

WindowsError: [Error 32] The process cannot access the file because it is being used by another process: 'deleteme.npz'

Example:

import os
import numpy
a =  numpy.array([[1, 2, 3], [4, 5, 6]])
filenameNPZ = "deleteme.npz"
numpy.savez(filenameNPZ, a = a)
npz = numpy.load(filenameNPZ)
del npz
os.remove(filenameNPZ)

[thouis]

@pv wrote on 2010-10-10

Should be fixed in 8630830 and 87c53b4

[thouis]

Milestone changed to 1.5.1 by @pv on 2010-10-10

[thouis]

Attachment added by trac user weegreenblobbie on 2011-04-20: numpy_bug.py

[thouis]

trac user weegreenblobbie wrote on 2011-04-20

This bug is still present in 1.5.1, too many files are left open. Running the attached script produces:

$ python numpy_bug.py
numpy.version = 1.5.1
FAILURE
i = 1021
Traceback (most recent call last):
File "numpy_bug.py", line 37, in
IOError: [Errno 24] Too many open files: 'bug.npz'

A workaround is also in the script.

[thouis]

Milestone changed to Unscheduled by trac user weegreenblobbie on 2011-04-20

[thouis]

trac user weegreenblobbie wrote on 2011-04-20

I should have included the following:

1. Ubuntu 10.04 64-bit
2. Python 2.7.1
3. numpy 1.5.1

[ewmoore]

Pretty sure this was fixed when #203 was merged.

[charris]

Yep, test case passes.