code: def sign():
      if randrange(2):
          if randrange(2):
              return "+"
          return ""
      return "-"
  
imports: from random import randrange, sample
  from fractions import Fraction
  from randfloat import un_randfloat, bin_randfloat, tern_randfloat
label_desc: Use image node_id 1 for calling a global function with example usage: sign() and returns: str, str, str