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    "# Built-in Functions and Help"
   ]
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   "source": [
    "## Use comments to add documentation to programs."
   ]
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    "## A function may take zero or more arguments.\n"
   ]
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    "* We've already seen some built-in functions\n",
    "* print(), len(), int(), float(), str()\n",
    "* Always with parenthesis, even if empty"
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   "source": [
    "## Commonly-used built-in functions"
   ]
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    "* max() , min()\n",
    "* round(), will round off a floating-point number.By default, rounds to zero decimal places."
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   "source": [
    "## Use the built-in function <span class=\"label label-default\">help</span> to get help for a function."
   ]
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   "source": [
    "* Every built-in function has online documentation."
   ]
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    "## The Jupyter Notebook has two ways to get help.\n",
    "* Place the cursor inside the parenthesis of the function, hold down shift, and press tab.\n",
    "* Or type a function name with a question mark after it."
   ]
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   "source": [
    "## Every function returns something.\n"
   ]
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    "* Every function call produces some result.\n",
    "* If the function doesn’t have a useful result to return, it usually returns the special value None."
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    "<div class=\"panel panel-primary\">\n",
    " <div class=\"panel-heading\">\n",
    "    <h3 class=\"panel-title\">Key Points</h3>\n",
    "  </div>\n",
    "  <div class=\"panel-body\">\n",
    "  <ul>\n",
    " <li>Use comments to add documentation to programs.</li>\n",
    " <li>A function may take zero or more arguments.</li>\n",
    " <li>Commonly-used built-in functions include max, min, and round.</li>\n",
    " <li>Functions may have default values for some arguments.</li>\n",
    " <li>Use the built-in function help to get help for a function.</li>\n",
    " <li>The Jupyter Notebook has two ways more to get help.</li>\n",
    " <li>Every function returns something.</li>\n",
    " </ul>  \n",
    "</div>\n",
    "</div>"
   ]
  }
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