minor edits

Author: tomvannuenen

lessons/3_Pandas.ipynb

@@ -146,6 +146,15 @@
     "df = pd.read_csv('../data/gapminder.csv')"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "df['country'].value_counts().sort_index()"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -418,6 +427,15 @@
     "Fill in the code below to subset our data frame to include only people with a life expectancy (`lifeExp`) less than 50."
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "df.shape"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,