8000 Control flow: add some intermediate exercises (#104) · gaehlerm/python-tutorial@4186517 · GitHub
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Control flow: add some intermediate exercises (empa-scientific-it#104)
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‎control_flow.ipynb

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"- [The `for` loop](#The-for-loop)\n",
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" - [The `enumerate` built-in](#The-enumerate-built-in)\n",
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" - [The `range` built-in](#The-range-built-in)\n",
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"- [Warm-up exercises 👈 **solve these first**](#Warm-up-exercises)\n",
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"- [Nested loops](#Nested-loops)\n",
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"- [Altering loops](#Altering-loops)\n",
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" - [`if` statement inside `for`/`while`](#if-statement-inside-for/while)\n",
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"Why writing six lines of code when we can do the same with just two?"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "84c2e6b1",
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"metadata": {},
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"outputs": [],
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"source": []
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},
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{
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"cell_type": "markdown",
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"id": "5b0747a4",
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"</div>"
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]
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},
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{
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"cell_type": "markdown",
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"id": "efb1a53e-a447-4808-bbb3-34a614d35735",
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"metadata": {
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"tags": []
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},
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"source": [
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"## Warm-up exercises\n",
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"\n",
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"Here are a few exercises to practice the concepts seen above.\n",
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"\n",
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"<div class=\"alert alert-block alert-danger\">\n",
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" <h4><b>Important</b></h4>\n",
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" <ul>\n",
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" <li>Try to use loop constructs like <code>for</code> or <code>while</code>, and the built-in iteration functions like <code>range()</code></li>\n",
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" <li>Try to solve these exercises <strong>first</strong> before attempting any of those suggested in the last section.</li>\n",
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" </ul>\n",
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"</div>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "530cb91a-1243-401b-84a0-ff7973833908",
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"metadata": {
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"tags": []
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},
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"outputs": [],
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"source": [
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"%reload_ext tutorial.tests.testsuite"
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]
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},
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{
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"cell_type": "markdown",
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"id": "e23dfd66-a14b-4346-af3d-9b1419063c84",
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"metadata": {},
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"source": [
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"#### 1. Write a Python program that returns the characters in a string and their indexes\n",
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"\n",
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"\n",
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"<div class=\"alert alert-block alert-warning\">\n",
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" <h4><b>Note</b></h4> \n",
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" The index should be returned <strong>after</strong> the corresponding character.\n",
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"</div>\n",
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"\n",
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"For example, if the string is `python`, the result should be `[('p', 0), ('y', 1), ('t', 2), ('h', 3), ('o', 4), ('n', 5)]`"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "4eb8fcdc-eed6-469b-891b-817e8b4dd23c",
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"metadata": {
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"tags": []
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},
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"outputs": [],
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"source": [
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"%%ipytest\n",
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"\n",
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"def solution_indexed_string(string: str) -> list[tuple]:\n",
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" \"\"\"\n",
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" Write your solution here\n",
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" \"\"\"\n",
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" return"
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]
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},
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{
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"cell_type": "markdown",
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"id": "679b0816-3b20-4001-a39a-5558179bb9de",
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"metadata": {
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"tags": []
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},
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"source": [
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"#### 2. Write a Python program that returns all the numbers in a given range, __including__ the first and the last elements\n",
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"\n",
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"<div class=\"alert alert-block alert-warning\">\n",
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" <h4><b>Note</b></h4>\n",
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" Ranges can also contain <strong>decreasing</strong> numbers. Make sure to build the correct range.\n",
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"</div>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "c24d6340-4731-4776-b800-f2ef01f8afaf",
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"metadata": {
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"tags": []
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},
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"outputs": [],
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"source": [
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"%%ipytest\n",
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"\n",
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"def solution_range_of_nums(start: int, end: int) -> list[int]:\n",
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" \"\"\"\n",
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" Write your solution here\n",
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" \"\"\"\n",
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" return"
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]
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},
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{
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"cell_type": "markdown",
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"id": "9823551f-1ea7-44b7-9dc3-2e002331e334",
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"metadata": {
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"tags": []
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},
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"source": [
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"#### 3. Write a Python program that takes a list of integers and returns the square root of each of them\n",
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"\n",
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"<div class=\"alert alert-block alert-info\">\n",
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" <h4><b>Hints</b></h4>\n",
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" <ul>\n",
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" <li>You can use the <code>math.sqrt</code> function to compute the square root of a number</li>\n",
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" <li>Be sure to check that it makes sense to compute the square root</li>\n",
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" </ul>\n",
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"</div>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "4fc3cab5-6d16-43a4-adf8-8560a0c29558",
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"metadata": {
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"tags": []
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},
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"outputs": [],
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"source": [
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"%%ipytest\n",
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"\n",
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"import math\n",
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"\n",
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"def solution_sqrt_of_nums(numbers: list) -> list:\n",
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" \"\"\"\n",
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" Write your solution here\n",
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" \"\"\"\n",
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" return"
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]
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},
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{
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"cell_type": "markdown",
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"id": "692f608f-2e79-4ad4-9a3d-ec9625941f81",
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"metadata": {},
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"source": [
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"#### 4. Write a Python program that takes an integer and divides it until the result is no longer an even number"
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]
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},
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{
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"cell_type": "markdown",
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"id": "2d06d01d-21a6-479d-bdbf-38de3151f9d3",
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"metadata": {},
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"source": [
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"<div class=\"alert alert-block alert-info\">\n",
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" <h4><b>Hint</b></h4>\n",
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" Your program should <strong>return</strong> the number when the iteration stopped\n",
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"</div>"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "4d83467c-e736-4b27-b9c2-9ade4a70a918",
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"metadata": {
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"tags": []
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},
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"outputs": [],
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"source": [
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"%%ipytest\n",
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"\n",
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"def solution_divide_until(num: int) -> int:\n",
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" \"\"\"\n",
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" Write your solution here\n",
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" \"\"\"\n",
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" return"
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]
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},
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{
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"cell_type": "markdown",
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"id": "e906c5d5-bc12-4829-b290-ed17ac1ddb3d",
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"metadata": {},
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"source": [
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"---"
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]
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},
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{
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"cell_type": "markdown",
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"id": "642d0ffe-b8c9-4076-a2e2-1b86722cf1a1",
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{
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"cell_type": "markdown",
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"id": "478550ff-87ad-45f5-adcb-1f486bfb5689",
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"metadata": {},
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"metadata": {
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"tags": []
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},
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"source": [
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"## Exceptions"
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]
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{
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"cell_type": "markdown",
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"id": "542fdbf1-d9e5-4f71-baac-e66899c99292",
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"metadata": {},
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"metadata": {
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"jp-MarkdownHeadingCollapsed": true,
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"tags": []
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},
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"source": [
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"## The `try-except` block"
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]
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"cell_type": "markdown",
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"id": "26f986e9-dd0e-4445-b6df-73aee64c565b",
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"metadata": {
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"jp-MarkdownHeadingCollapsed": true,
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"tags": []
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},
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"source": [
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{
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"cell_type": "markdown",
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"id": "5c2e26a7-31f4-4419-a68d-811da56adfb1",
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"metadata": {
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"jp-MarkdownHeadingCollapsed": true,
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"tags": []
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},
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"source": [
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"## Find the pair 🌶️"
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]
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},
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{
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"cell_type": "markdown",
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"id": "e04d871e-16ae-4209-9118-7fdbc1d90d61",
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"metadata": {},
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"source": [
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"## Find the pair 🌶️\n",
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"\n",
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"Given a list of integers, your task is to complete the code below that finds the pair of numbers in the list that add up to `2020`. The list of numbers is already available as the variable `nums`.\n",
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"\n",
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"<div class=\"alert alert-block alert-warning\">\n",
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{
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"cell_type": "markdown",
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"id": "4156c367-e1b8-400c-bb2f-71c812c8ee7a",
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"metadata": {},
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"metadata": {
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"jp-MarkdownHeadingCollapsed": true,
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"tags": []
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},
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"source": [
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"### Part 1"
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]
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{
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"cell_type": "markdown",
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"id": "55055676-4a91-4c45-8db6-b1736a958138",
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"metadata": {
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"jp-MarkdownHeadingCollapsed": true,
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"tags": []
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},
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"source": [
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"### Part 2"
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]
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},
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{
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"cell_type": "markdown",
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"id": "44c96dcd-d89d-4073-9e8f-226efd124d99",
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"metadata": {},
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"source": [
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"### Part 2\n",
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"\n",
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"<div class=\"alert alert-block alert-warning\">\n",
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" <h4><b>Question</b></h4>\n",
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" Can you find the <b>product</b> of <em>three</em> numbers that add up to <code>2020</code>?\n",
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{
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"cell_type": "markdown",
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"id": "cc5d1993-29ab-4e73-911f-61830a220c4e",
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"metadata": {
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"jp-MarkdownHeadingCollapsed": true,
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"tags": []
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},
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"source": [
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"## Cats with hats 🌶️🌶️"
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]
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},
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{
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"cell_type": "markdown",
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"id": "cf68ea90-36ea-4017-8b13-ab90455c5252",
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"metadata": {},
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"source": [
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"## Cats with hats 🌶️🌶️\n",
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"\n",
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"You have 100 cats.\n",
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"One day you decide to arrange all your cats in a giant circle. Initially, none of your cats have any hats on. You walk around the circle 100 times, always starting at the same spot, with the first cat (cat #1).\n",
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"\n",
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"cell_type": "markdown",
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"id": "ef9ce337-7a8b-4766-9593-28edf579fe25",
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"metadata": {
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"jp-MarkdownHeadingCollapsed": true,
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"tags": []
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},
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"source": [

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