Hi all, When using Python 2.4.x on a Win32 box, marshal.loads(marshal.dumps(1e66666)) returns 1.0 instead of infinity as it should and does under Python 2.5 (also running on Win32 ).
This problem was reported in another thread here by Peter Hansen http://groups-beta.google.com/group/comp.lang.python/browse_frm/thread/5c2b4b2a88c8df4/f216739705c9304f?lnk=gst&q=simplejson&rnum=5#f216739705c9304f Is this considered an important enough bug to fix it in Python 2.4? The following script exercise the problem when executed:: #---------------------------test_marshal.py-------------------------------------------------- import marshal INFINITY = 1e66666 inf = 1e300 * 1e300 nan = inf - inf def show(title, msg): print '%-10s : ' % title, msg2 = '' count = 0 for chr in msg: count += 1 val = ord(chr) print hex(val), if 31 < val < 128: msg2 += chr else: msg2 += '.' print ' ' * (9-count), ' : ', msg2 show('Nan', marshal.dumps(nan)) show('Infinity', marshal.dumps(INFINITY)) show('Infinity', marshal.dumps(inf)) show('Infinity', marshal.dumps(1e666)) val = marshal.loads(marshal.dumps(1e666)) print val val = marshal.loads(marshal.dumps(INFINITY)) print val assert val==INFINITY #------------------------------------------------------------------------------------------------------- When running the script on Win32 box with Python 2.4.3 or 2.4.4 I get:: D:\dev\python\test>t_marshal Nan : 0x66 0x7 0x2d 0x31 0x2e 0x23 0x49 0x4e 0x44 : f.-1.#IND Infinity : 0x66 0x6 0x31 0x2e 0x23 0x49 0x4e 0x46 : f.1.#INF Infinity : 0x66 0x6 0x31 0x2e 0x23 0x49 0x4e 0x46 : f.1.#INF Infinity : 0x66 0x6 0x31 0x2e 0x23 0x49 0x4e 0x46 : f.1.#INF 1.0 1.0 Traceback (most recent call last): File "D:\dev\python\test\t_marshal.py", line 33, in ? assert val==INFINITY AssertionError But when running the same script on a Win32 box, using Python 2.5, I get:: C:\dev\python\test>t_marshal Nan : 0x67 0x0 0x0 0x0 0x0 0x0 0x0 0xf8 0xff : g........ Infinity : 0x67 0x0 0x0 0x0 0x0 0x0 0x0 0xf0 0x7f : g.......¦ Infinity : 0x67 0x0 0x0 0x0 0x0 0x0 0x0 0xf0 0x7f : g.......¦ Infinity : 0x67 0x0 0x0 0x0 0x0 0x0 0x0 0xf0 0x7f : g.......¦ 1.#INF 1.#INF #------------------------------------------------- -- Pierre Rouleau -- http://mail.python.org/mailman/listinfo/python-list
