Python 32-bit on Windows 64-bit

Martin v. Loewis martin at
Fri Feb 11 15:54:25 EST 2011

Am 11.02.2011 19:41, schrieb Craig Yoshida:
> what kind of memory limitations to processes running on 32-bit python
> (with 32-bit C extensions like scipy) have on 64-bit Windows?   I'm
> having occasional MemoryErrors when running a python program on
> 64-bit Windows 7 that runs fine on my OS X machine.  Both machines
> are using a 64-bit OS and have 4GB of RAM.

In addition to the limitations Michel reports: on a 32-bit system,
objects are typically limited to using at most 2GiB, per object
(of course, you could have at most two objects that come close to
this size, since the whole address space would not be larger than


More information about the Python-list mailing list