"Fredrik Lundh" <fredrik at pythonware.com> writes: > Python *integer* objects are limited to that size on platforms > where a C long is 32 bits. I believe there is another limit: the maximum length of a string, list, or tuple is 2**31-1 on 64-bit platforms where a C int is 4 bytes. That, in particular, includes mmapped objects as well. Regards, Martin