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, 21 insertions, 0 deletions

diff --git a/tests/basics/string_count.py b/tests/basics/string_count.py
new file mode 100644
index 0000000000..42f807c939
--- /dev/null
+++ b/tests/basics/string_count.py
@@ -0,0 +1,21 @@
+print("asdfasdfaaa".count("asdf", -100))
+print("asdfasdfaaa".count("asdf", -8))
+print("asdf".count('s', True))
+print("asdf".count('a', True))
+print("asdf".count('a', False))
+print("asdf".count('a', 1 == 2))
+print("hello world".count('l'))
+print("hello world".count('l', 5))
+print("hello world".count('l', 3))
+print("hello world".count('z', 3, 6))
+print("aaaa".count('a'))
+print("aaaa".count('a', 0, 3))
+print("aaaa".count('a', 0, 4))
+print("aaaa".count('a', 0, 5))
+print("aaaa".count('a', 1, 5))
+print("aaaa".count('a', -1, 5))
+
+def t():
+    return True
+
+print("0000".count('0', t()))