include info on number of masses in the mass list

binarycpython/utils/spacing_functions.py

@@ -383,6 +383,6 @@ def const_dt(self,
         mass_list = np.log10(mass_list)
 
     if showlist:
-        print("const_dt mass list\n",mass_list)
+        print("const_dt mass list ({} masses)\n".format(len(mass_list)),mass_list)
 
     return mass_list