code: def mpf_sign(s):
      """Return -1, 0, or 1 (as a Python int, not a raw mpf) depending on
      whether s is negative, zero, or positive. (Nan is taken to give 0.)
      """
      sign, man, exp, bc = s
      if not man:
          if s == finf:
              return 1
          if s == fninf:
              return -1
          return 0
      return (-1) ** sign
  
imports: import math
  from bisect import bisect
  import sys
  from .backend import MPZ, MPZ_TYPE, MPZ_ZERO, MPZ_ONE, MPZ_TWO, MPZ_FIVE, BACKEND, STRICT, HASH_MODULUS, HASH_BITS, gmpy, sage, sage_utils
  from .libintmath import giant_steps, trailtable, bctable, lshift, rshift, bitcount, trailing, sqrt_fixed, numeral, isqrt, isqrt_fast, sqrtrem, bin_to_radix
label_desc: Use image node_id 38 for calling a global function with example usage: mpf_sign(s) and returns: unknown, int, int, unknown