diff --git a/python/1_1_Notebooks.ipynb b/python/1_1_Notebooks.ipynb
index 56b3da7..671d8db 100644
--- a/python/1_1_Notebooks.ipynb
+++ b/python/1_1_Notebooks.ipynb
@@ -140,7 +140,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 2,
    "metadata": {
     "collapsed": false
    },
@@ -151,7 +151,7 @@
        "4"
       ]
      },
-     "execution_count": 5,
+     "execution_count": 2,
      "metadata": {},
      "output_type": "execute_result"
     }
diff --git a/python/1_2_Numbers_Strings.ipynb b/python/1_2_Numbers_Strings.ipynb
index 2a48f4f..46ce26d 100644
--- a/python/1_2_Numbers_Strings.ipynb
+++ b/python/1_2_Numbers_Strings.ipynb
@@ -48,11 +48,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {
     "collapsed": false
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "False"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "True and False # operations with booleans"
    ]
diff --git a/python/1_3_Sequences.ipynb b/python/1_3_Sequences.ipynb
index 460ab21..0d18ee6 100644
--- a/python/1_3_Sequences.ipynb
+++ b/python/1_3_Sequences.ipynb
@@ -569,7 +569,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {
     "collapsed": false
    },
@@ -580,33 +580,66 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "metadata": {
     "collapsed": false
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "range(0, 10)"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "r"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
    "metadata": {
     "collapsed": false
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "True"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "5 in r # check if a number is in a range"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 4,
    "metadata": {
     "collapsed": false
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "2"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "r[2] # Get a value"
    ]
diff --git a/python/1_5_ControlFlow.ipynb b/python/1_5_ControlFlow.ipynb
index 1ee82fa..d6a3161 100644
--- a/python/1_5_ControlFlow.ipynb
+++ b/python/1_5_ControlFlow.ipynb
@@ -68,11 +68,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {
     "collapsed": false
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "6"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "import random # import random before using it\n",
     "x = random.randrange(1, 10) # generate a random integer between [1, 10] (both included)\n",