(string1, string2)
| 210 | |
| 211 | @staticmethod |
| 212 | def string_add(string1, string2): |
| 213 | if string1 is None or string2 is None: |
| 214 | return None |
| 215 | return str(Precise(string1).add(Precise(string2))) |
| 216 | |
| 217 | @staticmethod |
| 218 | def string_sub(string1, string2): |