Add video and streamline content

07_sequences_01_review.ipynb

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    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Read [Chapter 7](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/master/07_sequences_00_lecture.ipynb) of the book. Then, work through the questions below."
+    "The questions below assume that you have read [Chapter 7](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/master/07_sequences_00_lecture.ipynb) in the book.\n",
+    "\n",
+    "Be concise in your answers! Most questions can be answered in *one* sentence."
    ]
   },
   {
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    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    " "
+    " < your answer >"
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    "cell_type": "markdown",
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+    " < your answer >"
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    "cell_type": "markdown",
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+    " < your answer >"
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+    " < your answer >"
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    "cell_type": "markdown",
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-    " "
+    " < your answer >"
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    "cell_type": "markdown",
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+    " < your answer >"
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    "cell_type": "markdown",
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+    " < your answer >"
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    "cell_type": "markdown",
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+    " < your answer >"
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    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    " "
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "**Q9**: With the [map()](https://docs.python.org/3/library/functions.html#map) and [filter()](https://docs.python.org/3/library/functions.html#filter) built-ins and the [reduce()](https://docs.python.org/3/library/functools.html#functools.reduce) function from the [functools](https://docs.python.org/3/library/functools.html) module in the [standard library](https://docs.python.org/3/library/index.html), we can replace many tedious `for`-loops and `if` statements. What are some advantages of doing so?"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    " "
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "**Q10**: Looking at the `lambda` expression inside [reduce()](https://docs.python.org/3/library/functools.html#functools.reduce) below, what \"simple\" [built-in function](https://docs.python.org/3/library/functions.html) is mimicked here?"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "```python\n",
-    "from functools import reduce\n",
-    "\n",
-    "numbers = [7, 11, 8, 5, 3, 12, 2, 6, 9, 10, 1, 4]\n",
-    "\n",
-    "reduce(lambda x, y: x if x > y else y, numbers)\n",
-    "```"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    " "
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "**Q11**: What is the primary use case of **list comprehensions**? Why do we describe them as **eager**?"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    " "
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "**Q12**: **Generator expressions** may replace `list` objects and list comprehensions in many scenarios. When evaluated, they create a **lazy** `generator` object that does *not* **materialize** its elements right away. What do we mean by that? What does it mean for a `generator` object to be **exhausted**?"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
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-   ]
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-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "**Q13**: What does it mean for the **boolean reducers**, the built-in [all()](https://docs.python.org/3/library/functions.html#all) and [any()](https://docs.python.org/3/library/functions.html#any) functions, to follow the **short-circuiting** strategy?"
-   ]
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-  {
-   "cell_type": "markdown",
-   "metadata": {},
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-    " "
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-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "**Q14**: What is an **iterator**? How does it relate to an **iterable**?"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    " "
+    " < your answer >"
    ]
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   {
@@ -279,84 +184,42 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "**Q15**: `sequence` objects are *not* part of core Python but may be imported from the [standard library](https://docs.python.org/3/library/index.html)."
+    "**Q9**: `sequence` objects are *not* part of core Python but may be imported from the [standard library](https://docs.python.org/3/library/index.html)."
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    " "
+    " < your answer >"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "**Q16**: The built-in [sort()](https://docs.python.org/3/library/stdtypes.html#list.sort) function takes a *finite* **iterable** as its argument an returns a *new* `list` object. On the contrary, the [sorted()](https://docs.python.org/3/library/functions.html#sorted) method on `list` objects *mutates* them *in place*."
+    "**Q10**: The built-in [sort()](https://docs.python.org/3/library/stdtypes.html#list.sort) function takes a *finite* **iterable** as its argument an returns a *new* `list` object. On the contrary, the [sorted()](https://docs.python.org/3/library/functions.html#sorted) method on `list` objects *mutates* them *in place*."
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    " "
+    " < your answer >"
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "**Q17**: Passing **mutable** objects as arguments to functions is not problematic because functions operate in a **local** scope without affecting the **global** scope."
+    "**Q11**: Passing **mutable** objects as arguments to functions is not problematic because functions operate in a **local** scope without affecting the **global** scope."
    ]
   },
   {
    "cell_type": "markdown",
    "metadata": {},
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-    " "
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "**Q18**: `lambda` expressions are useful in the context of the **map-filter-reduce** paradigm, where we often do *not* re-use a `function` object more than once."
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    " "
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "**Q19**: Using **generator expressions** in place of **list comprehensions** wherever possible is a good practice as it makes our programs use memory more efficiently."
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    " "
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "**Q20**: Just as **list comprehensions** create `list` objects, **tuple comprehensions** create `tuple` objects."
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    " "
+    " < your answer >"
    ]
   }
  ],