solve build issue on Debian unstable i386

* tests/python/_product_weak.ipynb: Split large loop in two cells.

tests/python/_product_weak.ipynb

@@ -3398,7 +3398,22 @@
      },
      "metadata": {},
      "output_type": "display_data"
-    },
+    }
+   ],
+   "source": [
+    "autslen = len(auts)\n",
+    "# We have trouble with Jupyter on i386, where running the full loop abort with some low-level \n",
+    "# exeptions from Jupyter client. \n",
+    "for left in auts[0:autslen//2]:\n",
+    "    for right in auts:\n",
+    "        display_inline(left, right, spot.product(left, right))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [
     {
      "data": {
       "text/html": [
@@ -6508,17 +6523,15 @@
     }
    ],
    "source": [
-    "for left in auts:\n",
+    "for left in auts[autslen//2:]:\n",
     "    for right in auts:\n",
     "        display_inline(left, right, spot.product(left, right))"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
-   "metadata": {
-    "scrolled": false
-   },
+   "execution_count": 5,
+   "metadata": {},
    "outputs": [
     {
      "data": {
@@ -10137,7 +10150,21 @@
      },
      "metadata": {},
      "output_type": "display_data"
-    },
+    }
+   ],
+   "source": [
+    "for left in auts[0:autslen//2]:\n",
+    "    for right in auts:\n",
+    "        display_inline(left, right, spot.product_or(left, right))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "scrolled": false
+   },
+   "outputs": [
     {
      "data": {
       "text/html": [
@@ -13363,7 +13390,7 @@
     }
    ],
    "source": [
-    "for left in auts:\n",
+    "for left in auts[autslen//2:]:\n",
     "    for right in auts:\n",
     "        display_inline(left, right, spot.product_or(left, right))"
    ]
@@ -13392,7 +13419,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.5"
+   "version": "3.6.7rc1"
   }
  },
  "nbformat": 4,