Exercise-3-problem-4.ipynb

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    "## Problem 4 - Nested `for` loops (*optional, does not affect grading*)\n",
    "\n",
    "**Warning:** This is a difficult problem. Try to do this task only if you have confidence in programming, and you are up for a little challenge. :) \n",
    "\n",
    "In addition to having single `for` loops that iterate across some variable range, it is possible to *nest* `for` loops within one another.\n",
    "\n",
    "Consider the example below:\n",
    "\n",
    "```python\n",
    ">>> for char in 'dog':\n",
    "...     for char2 in 'cat':\n",
    "...         print (char, char2)\n",
    "    d c\n",
    "    d a\n",
    "    d t\n",
    "    o c\n",
    "    o a\n",
    "    o t\n",
    "    g c\n",
    "    g a\n",
    "    g t\n",
    "```\n",
    "\n",
    "Here, you can see that in the first pass through the first `for` loop, the value of `char` is `d`.\n",
    "Entering the inner (or nested) loop, `char2` is set to `c`.\n",
    "After this, the output is written to the screen and since there are more letters to loop over in the inner `for` loop, the value of `char2` will be updated upon the next pass.\n",
    "The second time through the inner loop, `char2` is set to `a` while `char` remains `d`.\n",
    "Like this, the inner loop will run through all of the letters in `cat` for each time that `char` is updated in the outer loop.\n",
    "It doesn't take too much imagination to figure out this is a very useful concept.\n",
    "\n",
    "For this problem you should do following:\n",
    "\n",
    "1. Create a variable `star` with text `\"*\"` and an empty string variable `text`. Recall, you can created empty string variables by assigning `\"\"` as their value.\n",
    "2. Use nested `for` loops and the variables above to produce the text formation below when `print(text)` is run at the end of your script.\n",
    "\n",
    "    ```\n",
    "    *******\n",
    "    *******\n",
    "    *******\n",
    "    ```\n",
    "3. Create a variable `line` with text `\"-\"` and an empty string variable `flag`.\n",
    "4. Use nested `for` loops and the variables above to produce the text formation below when `print(flag)` is run at the end of your script. **Note**: You will need to use conditional statements to produce the desired output.\n",
    "\n",
    "    ```\n",
    "    *******------------\n",
    "    *******------------\n",
    "    *******------------\n",
    "    -------------------\n",
    "    -------------------\n",
    "    ```\n"
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    "### Part 1\n",
    "\n",
    "- Your code for producing the asterisk square:"
   ]
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    "# YOUR CODE HERE\n",
    "raise NotImplementedError()\n",
    "text"
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    "print(text)"
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    "### Part 2\n",
    "\n",
    "- Your code for producing the flag:"
   ]
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    "# YOUR CODE HERE\n",
    "raise NotImplementedError()"
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    "print(flag)"
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   "source": [
    "### All done!\n",
    "\n",
    "Congrats, if you are here, you have finished all assignments for week 3, even the extra one! Bad-ass. &#128526;"
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