5.1-not-delayed.ipynb

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    "## Not Delayed version of ETL\n",
    "\n",
    "This is example matches the one in [Delayed](5-delayed.ipynb). But this one has no Dask."
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    "!rm -rf transformed_data_eager\n",
    "\n",
    "import os\n",
    "import time\n",
    "import random\n",
    "import pandas as pd\n",
    "\n",
    "os.mkdir(\"transformed_data_eager\")  \n",
    "\n",
    "def read_a_file(filename):\n",
    "    time.sleep(random.random())\n",
    "    df = pd.read_csv(f\"data/{filename}\", parse_dates=[\"timestamp\"], index_col=\"timestamp\")\n",
    "    return df\n",
    "\n",
    "def do_a_transformation(df):\n",
    "    time.sleep(random.random())\n",
    "    df[\"temperature_F\"] = df[\"temperature\"] * 9/5 + 32 \n",
    "    return df\n",
    "  \n",
    "def write_it_back_out(df, filename):\n",
    "    time.sleep(random.random())\n",
    "    path = f\"transformed_data_eager/{filename}\"\n",
    "    df.to_csv(path)\n",
    "    return path\n",
    "\n",
    "filenames = os.listdir(\"data\")\n",
    "\n",
    "outputs = []\n",
    "for filename in filenames:\n",
    "    df = read_a_file(filename)\n",
    "    df = do_a_transformation(df)\n",
    "    path = write_it_back_out(df, filename)\n",
    "    outputs.append(path)\n",
    "\n",
    "outputs"
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