Mike Stall wrote:
Traceback (most recent call last): File "<stdin>", line 1, in <module> SystemError: \loewis\25\python\Objects\stringobject.c:4236: bad argument to internal function Note that if c derives from 'int' instead of 'long', everything works as expected.
I'm able to reproduce the error with Python 2.5.1 and 2.5 svn on Linux. It also happens when I overwrite __hex__ and do "%x" % c(5) for subclasses of long but not for subclasses from int. class c(long): def __hex__(self): return "100" def __oct__(self): return "100"
x = c(5) hex(x) '100' oct(x) '100' "%o" % x Traceback (most recent call last): File "<stdin>", line 1, in <module> SystemError: Objects/stringobject.c:4269: bad argument to internal function "%x" % x Traceback (most recent call last): File "<stdin>", line 1, in <module> SystemError: Objects/stringobject.c:4269: bad argument to internal function
Objects/stringobject.c:_PyString_FormatLong(...) ... /* To modify the string in-place, there can only be one reference. */ if (result->ob_refcnt != 1) { PyErr_BadInternalCall(); return NULL; } ... Christian