Implement str.count and add tests for it.

Also modify mp_get_index to accept:
1. Indices that are or evaluate to a boolean.
2. Slice indices.
Add tests for these two cases.

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/basics/list_index.py b/tests/basics/list_index.py
index f28263fba6..a669e69c49 100644
--- a/tests/basics/list_index.py
+++ b/tests/basics/list_index.py
@@ -3,6 +3,16 @@ print(a.index(1))
 print(a.index(2))
 print(a.index(3))
 print(a.index(3, 2))
+print(a.index(1, -100))
+print(a.index(1, False))
+
+try:
+    print(a.index(1, True))
+except ValueError:
+    print("Raised ValueError")
+else:
+    print("Did not raise ValueError")
+
 try:
     print(a.index(3, 2, 2))
 except ValueError: