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    "# Practice Problems\n",
    "### Lecture 11\n",
    "Answer each number in a separate cell\n",
    "\n",
    "Rename this notebook with your last name, first initial and the lecture \n",
    "    \n",
    "    ex. Cych_B_11\n",
    "    \n",
    "Turn-in this notebook on Canvas."
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    "1. Lambda functions\n",
    "    - Write a regular function **s** that takes one argument and returns the square of that argument\n",
    "    - Write a **lambda** function called **square** that squares the input parameter\n",
    "    - Call your function **s** with the value 4. Print the output\n",
    "    - Call your function **square** with the value 4. Print the output\n",
    "\n",
    "2.  map( )\n",
    "    - create a list of values from 0 to 300 in intervals of 10 \n",
    "    - create a list of values from 0 to 90 in intervals of 3\n",
    "    - write an anonymous function that calculates the difference betwen two values\n",
    "    - apply **map( )** and the anonymous function to the two lists you defined\n",
    "    - print the results of the **map( )** function - remember to use **list( )** to make a list from the list generator made by **map( )** \n",
    "\n",
    "3.  filter( )\n",
    "    - Copy the following dictionary into a code cell:\n",
    "\n",
    "    **lastEruption = {\"Mt.Etna\": 2017, \"Mt. St. Helens\" :1980, \"Mt. Erebus\": 2017, \"Mount Teide\" : 1909, \"Mt. Hood\": 1800}**   \n",
    "\n",
    "    - Define an anonymous function **active** that returns a boolean. It should return **True** if a volcano has erupted in the last 5 years \n",
    "    - use the function **filter( )**, the function **active**, and the dictionary of volcanoes to determine which volcanoes have erupted in the last 5 years. \n",
    "    - Print the names of the recently active volcanoes \n",
    "\n",
    "4. reduce( )\n",
    "    - write an anonymous function that finds multiples of 7 \n",
    "    - write a different anonymous function that returns the greater of two numbers \n",
    "    - use your two anonymous functions with  **filter( )**  and **reduce( )** to find the greatest multiple of 7 in this list:\n",
    "\\[234, 55, 40, 100, 450, 335, 308, 693, 333, 405, 303, 109, 321, 565, 891\\]\n",
    "    - print the final value\n",
    "\n",
    "5. List comprehensions\n",
    "    - The following dictionary, **atomicNumbers**, has the atomic number of an element as the key and the element name as the value\n",
    "\n",
    "    **atomicNumbers = {1:'H', 2:\"He\", 3: \"Li\", 4:\"Be\", 5:\"B\", 6:\"C\", 7: \"N\", 8:\"O\", 9:\"F\", 10:\"Ne\", 11:\"Na\", 12:\"Mg\", 13:\"Al\", 14:\"Si\", 15:\"P\", 16:\"S\", 17:\"Cl\", 18:\"Ar\"}**\n",
    "    - The following list, **lifeElements**, contains the atomic numbers essential for life\n",
    "\n",
    "    **lifeElements = \\[6,1, 8,7,15,16\\]**\n",
    "    - use a list comprehension to print out the names of the elements that are essential for life.\n",
    "\n",
    "6.  Dictionary comprehensions\n",
    "    - The following list - elements- is a list of the first 18 elements in the periodic table\n",
    "\n",
    "    **elements = \\[\"H\", \"He\", \"Li\", \"Be\", \"B\", \"C\", \"N\", \"O\", \"F\", \"N\", \"Na\", \"Mg\", \"Al\", \"Si\", \"P\", \"S\", \"Cl\", \"Ar\"\\]**     \n",
    "    - Create a dictionary comprehension of the elements and their atomic number. The key is the element name while the value is the atomic number\n",
    "    - print the dictionary "
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