py: Fix mult by negative number of tuple, list, str, bytes.

Multiplication of a tuple, list, str or bytes now yields an empty
sequence (instead of crashing).  Addresses issue #799

Also added ability to mult bytes on LHS by integer.

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/basics/bytes_mult.py b/tests/basics/bytes_mult.py
new file mode 100644
index 000000000..0effd938e
--- /dev/null
+++ b/tests/basics/bytes_mult.py
@@ -0,0 +1,12 @@
+# basic multiplication
+print(b'0' * 5)
+
+# check negative, 0, positive; lhs and rhs multiplication
+for i in (-4, -2, 0, 2, 4):
+    print(i * b'12')
+    print(b'12' * i)
+
+# check that we don't modify existing object
+a = b'123'
+c = a * 3
+print(a, c)