Resolve "possibly unbound" error

wistaria · Nov 8, 2023 · 894afd3 · 894afd3
1 parent 68f21b4
commit 894afd3
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/example/grover.py b/example/grover.py
@@ -47,6 +47,9 @@ def grover(v, target, iter):
     elif len(sys.argv) == 3:
         n = int(sys.argv[1])
         target = q.util.str2binary(sys.argv[2])
+    else:
+        msg = "len(sys.argv) must be 1 or 3"
+        raise ValueError(msg)
     iter = 2 ** (n // 2)
     print("# number of qbits = {}".format(n))
     print("# target state = {}".format(q.util.binary2str(n, target)))