From 4b8ec5256d3d27b6cd69afeda62d645df4719ea9 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Fri, 3 Feb 2017 00:01:37 +1100
Subject: [PATCH] py/objfloat: Raise ZeroDivisionError for 0 to negative power.

---
 py/objfloat.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/py/objfloat.c b/py/objfloat.c
index 73d07feac..9292490a9 100644
--- a/py/objfloat.c
+++ b/py/objfloat.c
@@ -228,7 +228,12 @@ mp_obj_t mp_obj_float_binary_op(mp_uint_t op, mp_float_t lhs_val, mp_obj_t rhs_i
             }
             break;
         case MP_BINARY_OP_POWER:
-        case MP_BINARY_OP_INPLACE_POWER: lhs_val = MICROPY_FLOAT_C_FUN(pow)(lhs_val, rhs_val); break;
+        case MP_BINARY_OP_INPLACE_POWER:
+            if (lhs_val == 0 && rhs_val < 0) {
+                goto zero_division_error;
+            }
+            lhs_val = MICROPY_FLOAT_C_FUN(pow)(lhs_val, rhs_val);
+            break;
         case MP_BINARY_OP_DIVMOD: {
             if (rhs_val == 0) {
                 goto zero_division_error;