On Nov 11, 9:00 am, Mark Dickinson <[EMAIL PROTECTED]> wrote: > On Nov 10, 7:20 pm, "john.goodleaf" <[EMAIL PROTECTED]> wrote: > > > my own routines, does anyone know of an already-done means of writing > > integers and floats out to their IBM mainframe equivalents? > > Here's a quick attempt at converting doubles using Python. > It uses the isnan and isinf functions that are in Python 2.6; > if you don't have Python 2.6 or don't care about IEEE specials > then just delete the relevant lines. > > Mark > > def IBMtoIEEE(x): > """Convert a Python float (assumed stored as an IEEE 754 double) > to IBM hexadecimal float format.
Call me crazy if you like, but I'd name that function IEEEtoIBM. > return "%x" % (s*2**63 + e*2**56 + m) That's a hexadecimal representation in lowercase with no leading zeroes ... variable length and lowercase doesn't seem very IBM to me. The extremely ugly C code in http://support.sas.com/techsup/technote/ts140.html seems to indicate an 8-byte bigendian binary representation. Note that page contains a tohex() function which is not used AFAICT. Perhaps this would do the job: return struct.pack('>Q', s*2**63 + e*2**56 + m) Cheers, John -- http://mail.python.org/mailman/listinfo/python-list
