Update lz78.py

fixed some errors

Author: Ahmed99125

compression/lz78.py

@@ -51,13 +51,13 @@ def compress(self, text: str) -> list[Token]:
           '[(0, a), (0, b), (1, b), (0, c), (2, a), (5, b), (1, a)]'
           >>> str(lz78_compressor.compress("aacaacabcabaaac"))
           '[(0, a), (1, c), (1, a), (0, c), (1, b), (4, a), (0, b), (3, a)]'
-          >>> lz78_compressor.compress("")
-          []
-          >>> lz78_compressor.compress([])
-          []
-          >>> lz78_compressor.compress({})
-          []
-          >>> len("ababc") >= len(compressor.compress("ababc"))
+          >>> str(lz78_compressor.compress(""))
+          '[]'
+          >>> str(lz78_compressor.compress([]))
+          '[]'
+          >>> str(lz78_compressor.compress({}))
+          '[]'
+          >>> len("ababc") >= len(lz78_compressor.compress("ababc"))
           True
         """