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    "## Warm Up - counting 9s\n",
    "\n",
    "Write a python function to do the following\n",
    "\n",
    "Given an array of ints, return the number of 9's in the array.\n",
    "```\n",
    "array_count9([1, 2, 9]) → 1\n",
    "array_count9([1, 9, 9]) → 2\n",
    "array_count9([1, 9, 9, 3, 9]) → 3\n",
    "```"
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    "# Your code here\n"
   ]
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    "Write some tests for your functions. What are some edge cases you might consider?\n",
    "\n",
    "\n",
    "\n"
   ]
  },
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   "execution_count": 18,
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    "# Your code here\n"
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   "id": "14490e81-26eb-4c0e-91b0-1f34e4ccb8c9",
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    "Build up on this example, and write a function that takes a second optional argument that allows up to count any number passed in. It should default to 9.\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "id": "a48ab674-9995-4ebd-9846-e51591159c01",
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   "source": [
    "# Your code here\n"
   ]
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   "cell_type": "markdown",
   "id": "b0f7318b-2242-4946-a12c-06f9fa2ad88c",
   "metadata": {},
   "source": [
    "Write some tests for your functions. What are some edge cases you might consider?\n"
   ]
  },
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   "cell_type": "code",
   "execution_count": 22,
   "id": "9079f673-bf71-44bd-b526-7c464fdf3674",
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   "outputs": [],
   "source": [
    "# Your code here\n",
    "\n"
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