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Bug in Python3 ('tempfile' and 'subprocess')
- From: Giuseppe Scelsi <giuseppe dot scelsi at analog dot com>
- To: <cygwin at cygwin dot com>
- Date: Thu, 29 Mar 2018 10:15:49 +1100
- Subject: Bug in Python3 ('tempfile' and 'subprocess')
- Spamdiagnosticmetadata: NSPM
- Spamdiagnosticoutput: 1:99
Hi,
Using freshly-updated Cygwin 64-bit under Windows 7 Enterprise Ver 6.1
and Python 3 version 3.6.4.
Executing the following script:
import subprocess
import _hashlib
import _sha3
subprocess.run('pwd')
always results in 'BlockingIOError: [Errno 11] Resource temporarily
unavailable'. I saw this error first in a script that imported
'tempfile' together with 'subprocess'. I then managed to narrow down
the problem to the '_sha3' module. Notice that you need to import both
'_hashlib' and '_sha3' *in that order*.
This problem makes it impossible to use 'tempfile' and 'subprocess' in
the same script. My workaround is currently to disable '_sha3' in
'/usr/lib/python3.6/hashlib.py' by adding at line 62:
__always_supported = __always_supported[0:8]
This problem only happens in Cygwin 64, 32-bit Cygwin works ok.
Can anyone reproduce this problem?
Best regards,
Giuseppe
--
Giuseppe B. Scelsi (giuseppe.scelsi@analog.com)
Senior Design Engineer, Analog Devices Australia Pty Ltd
Unit 3, 97 Lewis Road, Wantirna, Victoria, 3152, AUSTRALIA
Direct: +61 3 9881 9909 Main: +61 3 9881 9999
Fax: +61 3 9881 9988 Web: www.analog.com/au
Embedded & Digital Signal Processing Software.
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