How do I determine if my python shell is executing in 32bit or 64bit mode on OS X?

0 votes

I need a way to tell what mode the shell is in from within the shell.

I've tried looking at the platform module but it seems only to tell you about "about the bit architecture and the linkage format used for the executable": the binary is compiled as 64bit though (I'm running on OS X 10.6) so it seems to always report 64bit even though I'm using the methods described hereto force 32bit mode).

Dec 11, 2018 in Python by charlie_brown
• 7,710 points
43 views

1 answer to this question.

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
0 votes

UPDATED: One way is to look at sys.maxsize as documented here:

$ python-32 -c 'import sys;print("%x" % sys.maxsize, sys.maxsize > 2**32)'
('7fffffff', False)
$ python-64 -c 'import sys;print("%x" % sys.maxsize, sys.maxsize > 2**32)'
('7fffffffffffffff', True)

sys.maxsize was introduced in Python 2.6. If you need a test for older systems, this slightly more complicated test should work on all Python 2 and 3 releases:

$ python-32 -c 'import struct;print( 8 * struct.calcsize("P"))'
32
$ python-64 -c 'import struct;print( 8 * struct.calcsize("P"))'
64

BTW, you might be tempted to use platform.architecture() for this. Unfortunately, its results are not always reliable, particularly in the case of OS X universal binaries.

$ arch -x86_64 /usr/bin/python2.6 -c 'import sys,platform; print platform.architecture()[0], sys.maxsize > 2**32'
64bit True
$ arch -i386 /usr/bin/python2.6 -c 'import sys,platform; print platform.architecture()[0], sys.maxsize > 2**32'
64bit False
answered Dec 11, 2018 by ariaholic
• 7,320 points

Related Questions In Python

0 votes
1 answer

How do I use urllib to see if a website is 404 or 200 in Python?

For Python 3, try doing this: import urllib.request, ...READ MORE

answered Nov 29, 2018 in Python by Nymeria
• 3,500 points

edited Dec 11, 2018 by Nymeria 132 views
0 votes
1 answer

How do I check if input string is a valid regular expression or not in Python?

Hi. Good question! Well, just like what ...READ MORE

answered Feb 12 in Python by Nymeria
• 3,500 points
14 views
0 votes
1 answer

How do I check which files are open or closed in Python?

Hi, good question. I have a solution ...READ MORE

answered Jan 29 in Python by Nymeria
• 3,500 points
14 views
+2 votes
6 answers

How can I change directory or "cd" in Python?

Context Manager: cd import os class cd:     """Context manager for ...READ MORE

answered Oct 18, 2018 in Python by Nabarupa
50 views
0 votes
1 answer

how can i count the items in a list?

suppose you have a list a = [0,1,2,3,4,5,6,7,8,9,10] now ...READ MORE

answered May 2 in Python by Mohammad
• 1,400 points
24 views
+4 votes
6 answers
0 votes
1 answer

How does Python know whether a variable in the class is a method or a variable?

In python objects/variables are wrapped into methods ...READ MORE

answered Sep 18, 2018 in Python by ariaholic
• 7,320 points
20 views
0 votes
1 answer

How can I prevent or alter access to class variables in Python?

The ActiveState solution that Pynt references makes instances of ...READ MORE

answered Dec 5, 2018 in Python by ariaholic
• 7,320 points
38 views

© 2018 Brain4ce Education Solutions Pvt. Ltd. All rights Reserved.
"PMP®","PMI®", "PMI-ACP®" and "PMBOK®" are registered marks of the Project Management Institute, Inc. MongoDB®, Mongo and the leaf logo are the registered trademarks of MongoDB, Inc.