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    "# Practice Problems\n",
    "### Lecture 2\n",
    "\n",
    "\n",
    "Answer each number in a separate cell\n",
    "\n",
    "Rename this notebook with your last name, first initial and the (2 digit) lecture number. \n",
    "    \n",
    "    ex. Cych_B_02\n",
    "    \n",
    "Turn in this notebook on Canvas. "
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    "1. Conceptual\n",
    "    - Insert a markdown cell into your practice notebook and answer the questions:\n",
    "        - Why are descriptive variable names useful?\n",
    "        - What are _reserved words_ and why can't you use them as variable names?\n",
    "\n",
    "2. Variables\n",
    "    - Insert a code cell into your practice notebook\n",
    "    - In it, define a variable that  stores the value of pi (3.1415)\n",
    "\t- Define a variable called **radius**, that stores any floating point number (radius)\n",
    "\t- Define a string that stores \"is the circumference of a circle with radius\" \n",
    "\n",
    "3. Operations\n",
    "    - Insert another code cell into your practice notebook.  \n",
    "\t- Calculate the circumference of a circle using the variables you defined earlier and store the answer in a separate variable.\n",
    "    - print your new variable.\n",
    "\n",
    "4. Changing variable types\n",
    "    - Convert all your variables (**circumference** and **radius**) into  strings\n",
    "    - Use the + operator to add  them together to make this string:\n",
    "\t\t**circumference** is the circumference of a circle with radius of **radius** \n",
    "    - **boldface** words are your new strings].  \n",
    "\n",
    "5. Strings and string operation\n",
    "\t- Define a variable with the value:\n",
    "\t\t\t\"Scripps Institution of Oceanography\"\n",
    "\t- Print out the first 7 characters \n",
    "    - print indices 8 to 19\n",
    "\t- Print index 23 to the end\n",
    "        \n",
    "6. Putting it all together\n",
    "\n",
    "    - Create an integer variable **depth** and set it to  6\n",
    "    - Create a string variable **planet** and set it to “Earth”\n",
    "    - convert the variable **depth** into a string \n",
    "    - Create a variable **ocean_depth** and set it to the string:  “The average ocean depth on Earth is 6 km” by using the variables depth and planet instead of Earth and 6\n",
    "    - print out the variable **ocean_depth**"
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