On Wed, Nov 8, 2017 at 6:44 AM, Stefan Ram <r...@zedat.fu-berlin.de> wrote: > Chris Angelico <ros...@gmail.com> writes: >>sure what your point is. None, False, and True are all keywords, not >>built-ins, so you can't assign to them (any more than you could assign >>to a literal integer). > > |Python 2.6.6 (r266:84297, Aug 24 2010, 18:13:38) [MSC v.1500 64 bit (AMD64)] > on win32 > |Type "help", "copyright", "credits" or "license" for more information. > |>>> > |>>> import ctypes > |>>> > |>>> value = 2 > |>>> ob_ival_offset = ctypes.sizeof(ctypes.c_size_t) + > ctypes.sizeof(ctypes.c_voidp) > |>>> ob_ival = ctypes.c_int.from_address(id(value)+ob_ival_offset) > |>>> ob_ival.value = 3 > |>>> > |>>> print 2 > |3
That's still not assigning to a literal; that's mutating a cached object. There's a difference :) Also, once you start messing with ctypes like this, all language guarantees are out the window. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
