intro-to-python/03_conditionals_review_and_exercises.ipynb

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    "\n",
    "# Chapter 3: Conditionals & Exceptions"
   ]
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   "source": [
    "## Content Review"
   ]
  },
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   "source": [
    "Read Chapter 3 of the book. Then work through the seven review questions."
   ]
  },
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   "source": [
    "### Essay Questions "
   ]
  },
  {
   "cell_type": "markdown",
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   "source": [
    "Answer the following questions briefly with *at most* 300 characters per question!"
   ]
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   "source": [
    "**Q1**: What is the **singleton** design pattern? How many objects does the expression `[True, False, True, False]` generate in memory?"
   ]
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    " "
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   "source": [
    "**Q2**: What do we mean when we talk about **truthy** and **falsy** expressions?"
   ]
  },
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   "source": [
    " "
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    "**Q3**: Explain how the conceptual difference between a **statement** and an **expression** relates to the difference between a **conditional statement** and a **conditional expression**."
   ]
  },
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   "source": [
    " "
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   "source": [
    "**Q4**: Why is the use of **temporary variables** encouraged in Python?"
   ]
  },
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   "source": [
    " "
   ]
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    "**Q5**: What does the `finally`-branch enforce in this code snippet? How can a `try` statement be useful *without* an `except`-branch?"
   ]
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    "```python\n",
    "try:\n",
    "    print(\"Make a request to a service on the internet\")\n",
    "finally:\n",
    "    print(\"This could be clean-up code\")\n",
    "```"
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    " "
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   "source": [
    "### True / False Questions"
   ]
  },
  {
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   "source": [
    "Motivate your answer with *one short* sentence!"
   ]
  },
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   "metadata": {},
   "source": [
    "**Q6**: The objects `True`, `False`, and `None` represent the idea of \"yes\", \"no\", and \"maybe\" answers in a natural language.\n",
    "\n",
    "Hint: you also respond with a code cell."
   ]
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    " "
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   "source": [
    "**Q7**: The `try` statement is useful for handling **syntax** errors."
   ]
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    " "
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    "## Coding Exercises"
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    "### Discounting Customer Orders"
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    "**Q8.1**: Write a function `discounted_price()` that takes the positional arguments `unit_price` (of type `float`) and `quantity` (of type `int`) and implements a discount scheme for a line item in a customer order as follows:\n",
    "\n",
    "- if the unit price is over 100 dollars, grant 10% relative discount\n",
    "- if a customer orders more than 10 items, one in every five items is for free\n",
    "\n",
    "Only one of the two discounts is granted, whichever is better for the customer.\n",
    "\n",
    "The function should then return the overall price for the line item. Do not forget to round appropriately."
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    "\n",
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    "**Q8.2**: Calculate the final price for the following line items of an order:\n",
    "- $7$ smartphones @ $99.00$ USD\n",
    "- $3$ workstations @ $999.00$ USD\n",
    "- $19$ GPUs @ $879.95$ USD\n",
    "- $14$ Raspberry Pis @ $35.00$ USD"
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    "**Q8.3**: Re-calculate the last two line items with order quantities of $20$ and $15$. What do you observe?"
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    " (your observation)"
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   "source": [
    "**Q8.4**: Looking at the `if`-`else`-logic in the function, why do you think the four example line items in **Q8.2** were chosen as they were?"
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    " "
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    "### Fizz Buzz revisited"
   ]
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   "source": [
    "When you worked on the Fizz Buzz exercise in Chapter 1, you actually did not know about the `elif` and `else` keywords yet. Well, now you do."
   ]
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   "source": [
    "numbers = list(range(1, 101))"
   ]
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    "**Q9**: Copy and paste your answer to **Q11.2** in Chapter 1 here and instead of three consecutive `if` statements re-write it with *one* compound `if` statement.\n",
    "\n",
    "This code will then be a lot more robust as the order of the three `if` statements cannot be screwed up."
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