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    "# Practice Problems\n",
    "### Lecture 5\n",
    "Answer each number in a separate cell\n",
    "\n",
    "Rename this notebook with your last name and the lecture \n",
    "    \n",
    "    ex. Cych_B_05\n",
    "    \n",
    "Turn-in this notebook on Canvas."
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    "1. Doc string\n",
    "    - Create a function  **greeting( )**. Include a doc string that explains what the function does\n",
    "    - In the body, use the command **print ('Hi there')**\n",
    "    - print out the docstring with **help(greeting)**\n",
    "2. Functions\n",
    "    - create a function  called **circleArea( )** . The function should take a radius as an argument and return the area of a circle with that radius ($A=\\pi r^2$). Include a doc string (as ALWAYS). \n",
    "    - call the function and print out the result\n",
    "    - Create a function called **add_em_up( )**  that takes an unspecified number of input floating point or integer arguments and returns their sum.\n",
    "    - Call the function with different numbers of arguments and print the sum.\n",
    "3. Modules\n",
    "    - Create a module **myMath.py**  by copying both functions **add\\_em\\_up(\\*args)** and **circleArea(r)** in a  cell\n",
    "    - rename the two functions **add** and **area**\n",
    "    - save the module by using the __%%writefile__ magic command and specifying the file name as **myMath.py**. \n",
    "    - import the **myMath.py** module into your Jupyter notebook and call each function in the module\n",
    "4. Local variables\n",
    "    - define a variable **myName** with your name\n",
    "    - define  a function **greeting( )**  that sets myName to \"John Doe\". The function should return the string   \"Hello\" and the variable **myName**\n",
    "    - print **myName**\n",
    "    - call the function **greeting( )** and print the output\n",
    "    - print **myName** again \n",
    "    - Has the value of **myName** changed after calling the function **greeting( )**?\n",
    "5. Global variables\n",
    "    - define a variable **name** with your name\n",
    "    - define a function **greet( )** that sets the global variable **name** to \"Jane Doe\". The function should return \"Hello\" and the variable **name**\n",
    "    - print **name**\n",
    "    - call the function **greet( )** and print the output \n",
    "    - print **name**\n",
    "    - Has the value of **name** changed after calling the function **greet( )**?"
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