On Jan 21, 5:36 pm, Gary Herron <[EMAIL PROTECTED]> wrote: > [EMAIL PROTECTED] wrote: > > How can I figure out the largest long available? I was hoping for > > something like sys.maxint, but I didn't see it. Also, can someone > > point me to where I can (concisely) read about size of such types > > (int, float, long). > > There is no explicit (defined) limit. The amount of available address > space forms a practical limit.
But not the only limitation: >>> import collatz_functions as cf >>> for k in xrange(1,20): a = cf.Type12MH(k,1) print 'number of digits in generation %2d:' % (k),cf.gmpy.numdigits(a) number of digits in generation 1: 2 number of digits in generation 2: 9 number of digits in generation 3: 74 number of digits in generation 4: 659 number of digits in generation 5: 5926 number of digits in generation 6: 53328 number of digits in generation 7: 479940 number of digits in generation 8: 4319453 number of digits in generation 9: 38875064 number of digits in generation 10: 349875565 Traceback (most recent call last): File "<pyshell#12>", line 2, in <module> a = cf.Type12MH(k,1) File "C:\Program Files\PyGTK\Python\lib\collatz_functions.py", line 745, in Type12MH return TWO**(SIX*a - ONE) - ONE ValueError: mpz.pow outrageous exponent The power function can't do exponents that have 32 or more bits even if the memory can hold the resulting number. > > Gary Herron -- http://mail.python.org/mailman/listinfo/python-list