[mypy] Add/fix annotations for boolean_algebra

CodeHermyt · CodeHermyt · commit 1ef42433a636 · 2021-02-03T03:55:23.000+05:30
diff --git a/boolean_algebra/quine_mc_cluskey.py b/boolean_algebra/quine_mc_cluskey.py
@@ -7,7 +7,7 @@ def compare_string(string1: str, string2: str) -> str:
     '0_10'
 
     >>> compare_string('0110','1101')
-    -1
+    'X'
     """
     l1 = list(string1)
     l2 = list(string2)
