99-Tips.ipynb

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   "source": [
    "# Tips"
   ]
  },
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    "Remove all spaces from the column names and replace them with underscores\n",
    "```python\n",
    "df.columns = df.columns.str.replace(‘ ‘,’_’)\n",
    "```\n",
    "\n",
    "Converting a price string with the currency symbol as the first character to float in a column (€12.34)\n",
    "```python\n",
    "df.priceAsValue = [float(value[1:-1]) for value in df.priceAsString]\n",
    "```\n",
    "Converting a column type to another type\n",
    "```python\n",
    "volunteer[\"hits\"] = volunteer[\"hits\"].astype(int)\n",
    "```"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Creating a dictionary with options and passing that to a function, useful for presets\n",
    "\n",
    "prepare initial style options\n",
    "```python\n",
    "options = dict(marker='o', color='blue')\n",
    "```\n",
    "call the plot method on the axis object\n",
    "```python\n",
    "line = axis.plot(x, y, **options)\n",
    "```"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Extract the two most important features\n",
    "```python\n",
    "important_indices = [feature_list.index('temp_1'), feature_list.index('average')]\n",
    "train_important = train_features[:, important_indices]\n",
    "test_important = test_features[:, important_indices]\n",
    "```"
   ]
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