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"# Chapter 8: Map, Filter, & Reduce (Review Questions)"
]
},
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"metadata": {},
"source": [
"The questions below assume that you have read the [first ![](\"../static/link/to_nb.png\")
](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/main/08_mfr/00_content.ipynb), [second ](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/main/08_mfr/01_content.ipynb), and [third ](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/main/08_mfr/04_content.ipynb) part in Chapter 8.\n",
"\n",
"Be concise in your answers! Most questions can be answered in *one* sentence."
]
},
{
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"metadata": {},
"source": [
"## Essay Questions "
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Q1**: With the [map() ![](\"../static/link/to_py.png\")
](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?"
]
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"metadata": {},
"source": [
" < your answer >"
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"cell_type": "markdown",
"metadata": {},
"source": [
"**Q2**: Looking at the `lambda` expression inside [reduce() ](https://docs.python.org/3/library/functools.html#functools.reduce) below, what [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": [
" < your answer >"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Q3**: What is the primary use case of **`list` comprehensions**? Why do we describe them as **eager**?"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
" < your answer >"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Q4**: **`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": {},
"source": [
" < your answer >"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Q5**: 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?"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
" < your answer >"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Q6**: What is an **iterator**? How does it relate to an **iterable**?"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
" < your answer >"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## True / False Questions"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Motivate your answer with *one short* sentence!"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Q7**: `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": [
" < your answer >"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Q8**: 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": [
" < your answer >"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**Q9**: Just as **`list` comprehensions** create `list` objects, **`tuple` comprehensions** create `tuple` objects."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
" < your answer >"
]
}
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