Added data loader from branch sean-csv-reader.

loader-cleaner.ipynb

@@ -0,0 +1,91 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import pandas as pd\n",
+    "import os"
+   ]
+  },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Load data from file into a pandas df"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "File 'hr.csv' loaded successfully.                                                                                      \n",
+      "Found 311 rows, 36 columns\n"
+     ]
+    }
+   ],
+   "source": [
+    "DATADIR=\"data/\"\n",
+    "FILENAME=None\n",
+    "\n",
+    "while FILENAME is None:\n",
+    "    \n",
+    "    file_candidate = input(\"Enter file name:\")\n",
+    "    if file_candidate == \"\": break\n",
+    "    \n",
+    "    try:\n",
+    "        print(f\"Assesing file '{file_candidate}'...\".ljust(120), end=\"\\r\")\n",
+    "        file_path = DATADIR + file_candidate\n",
+    "        extension = file_candidate.split(\".\")[-1] \n",
+    "        match extension:\n",
+    "            case \"csv\":\n",
+    "                df = pd.read_csv(file_path)\n",
+    "            case \"json\":\n",
+    "                df = pd.read_json(file_path)\n",
+    "            case \"xlsx\":\n",
+    "                df = pd.read_excel(file_path)\n",
+    "            case _:\n",
+    "                print(f\"Error: Invalid extension '{extension}'\")\n",
+    "                continue\n",
+    "        print(f\"File '{file_candidate}' loaded successfully.\")\n",
+    "        rows, columns = df.shape\n",
+    "        print(f\"Found {rows} rows, {columns} columns\")\n",
+    "        FILENAME = file_candidate\n",
+    "    except FileNotFoundError:\n",
+    "        print(f\"Error: '{file_candidate}' doesn't exist in {os.getcwd()}/{DATADIR}\")\n",
+    "    except Exception as error:\n",
+    "        print(f\"Error: Unable to read file '{file_candidate}' ({str(type(error))}: {error})\".ljust(120))"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.6"
+  },
+  "orig_nbformat": 4
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}