make "DataFrame" capitalization consistent

Author: afeld

lecture_1.ipynb

@@ -244,10 +244,12 @@
   {
    "cell_type": "markdown",
    "metadata": {
+    "editable": true,
     "id": "CRAqTQ2rbXAA",
     "slideshow": {
      "slide_type": "slide"
-    }
+    },
+    "tags": []
    },
    "source": [
     "## Today's goal\n",
@@ -276,9 +278,11 @@
   {
    "cell_type": "markdown",
    "metadata": {
+    "editable": true,
     "slideshow": {
      "slide_type": "subslide"
-    }
+    },
+    "tags": []
    },
    "source": [
     "### Start by importing necessary packages"
@@ -288,7 +292,12 @@
    "cell_type": "code",
    "execution_count": 2,
    "metadata": {
-    "id": "Q4l2QosJLzP6"
+    "editable": true,
+    "id": "Q4l2QosJLzP6",
+    "slideshow": {
+     "slide_type": ""
+    },
+    "tags": []
    },
    "outputs": [],
    "source": [
@@ -298,13 +307,15 @@
   {
    "cell_type": "markdown",
    "metadata": {
+    "editable": true,
     "id": "R1G04BmMMFJb",
     "slideshow": {
      "slide_type": "subslide"
-    }
+    },
+    "tags": []
    },
    "source": [
-    "### Read and save 311 Service Requests dataset as a pandas dataframe\n",
+    "### Read and save 311 Service Requests dataset as a pandas DataFrame\n",
     "\n",
     "We're using a sample to make it easier/faster to work with. This will take a while (~30 seconds)."
    ]
@@ -996,7 +1007,7 @@
     }
    ],
    "source": [
-    "requests.tail(10)  # last 10 records in the dataframe"
+    "requests.tail(10)  # last 10 records in the DataFrame"
    ]
   },
   {

lecture_2.ipynb

@@ -2615,7 +2615,7 @@
     "tags": []
    },
    "source": [
-    "To join dataframes together, we will use the [pandas `.merge()` function](https://pandas.pydata.org/pandas-docs/stable/getting_started/intro_tutorials/08_combine_dataframes.html#join-tables-using-a-common-identifier).\n",
+    "To join DataFrames together, we will use the [pandas `.merge()` function](https://pandas.pydata.org/pandas-docs/stable/getting_started/intro_tutorials/08_combine_dataframes.html#join-tables-using-a-common-identifier).\n",
     "\n",
     "![merge diagram](https://pandas.pydata.org/pandas-docs/stable/_images/08_merge_left.svg)"
    ]