primeiro commit com exercicios de Exercism realizados até esta data
This commit is contained in:
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{
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"authors": [
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"meatball133",
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"bethanyg"
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],
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"files": {
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"solution": [
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"resistor_color_expert.py"
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],
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"test": [
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"resistor_color_expert_test.py"
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],
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"example": [
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".meta/example.py"
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]
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},
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"blurb": "Convert color codes as used on resistors with different bands to a human-readable label.",
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"source": "Based on earlier resistor color exercises made by Erik Schierboom and Maud de Vries",
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"source_url": "https://github.com/exercism/problem-specifications/issues/1464"
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}
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{"track":"python","exercise":"resistor-color-expert","id":"89783c148cda4c0cac551639b1ee1c0b","url":"https://exercism.org/tracks/python/exercises/resistor-color-expert","handle":"sanctushck","is_requester":true,"auto_approve":false}
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# Help
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## Running the tests
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We use [pytest][pytest: Getting Started Guide] as our website test runner.
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You will need to install `pytest` on your development machine if you want to run tests for the Python track locally.
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You should also install the following `pytest` plugins:
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- [pytest-cache][pytest-cache]
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- [pytest-subtests][pytest-subtests]
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Extended information can be found in our website [Python testing guide][Python track tests page].
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### Running Tests
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To run the included tests, navigate to the folder where the exercise is stored using `cd` in your terminal (_replace `{exercise-folder-location}` below with your path_).
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Test files usually end in `_test.py`, and are the same tests that run on the website when a solution is uploaded.
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Linux/MacOS
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```bash
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$ cd {path/to/exercise-folder-location}
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```
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Windows
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```powershell
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PS C:\Users\foobar> cd {path\to\exercise-folder-location}
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```
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<br>
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Next, run the `pytest` command in your terminal, replacing `{exercise_test.py}` with the name of the test file:
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Linux/MacOS
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```bash
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$ python3 -m pytest -o markers=task {exercise_test.py}
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==================== 7 passed in 0.08s ====================
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```
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Windows
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```powershell
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PS C:\Users\foobar> py -m pytest -o markers=task {exercise_test.py}
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==================== 7 passed in 0.08s ====================
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```
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### Common options
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- `-o` : override default `pytest.ini` (_you can use this to avoid marker warnings_)
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- `-v` : enable verbose output.
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- `-x` : stop running tests on first failure.
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- `--ff` : run failures from previous test before running other test cases.
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For additional options, use `python3 -m pytest -h` or `py -m pytest -h`.
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### Fixing warnings
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If you do not use `pytest -o markers=task` when invoking `pytest`, you might receive a `PytestUnknownMarkWarning` for tests that use our new syntax:
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```bash
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PytestUnknownMarkWarning: Unknown pytest.mark.task - is this a typo? You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/mark.html
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```
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To avoid typing `pytest -o markers=task` for every test you run, you can use a `pytest.ini` configuration file.
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We have made one that can be downloaded from the top level of the Python track directory: [pytest.ini][pytest.ini].
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You can also create your own `pytest.ini` file with the following content:
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```ini
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[pytest]
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markers =
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task: A concept exercise task.
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```
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Placing the `pytest.ini` file in the _root_ or _working_ directory for your Python track exercises will register the marks and stop the warnings.
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More information on pytest marks can be found in the `pytest` documentation on [marking test functions][pytest: marking test functions with attributes] and the `pytest` documentation on [working with custom markers][pytest: working with custom markers].
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Information on customizing pytest configurations can be found in the `pytest` documentation on [configuration file formats][pytest: configuration file formats].
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### Extending your IDE or Code Editor
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Many IDEs and code editors have built-in support for using `pytest` and other code quality tools.
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Some community-sourced options can be found on our [Python track tools page][Python track tools page].
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[Pytest: Getting Started Guide]: https://docs.pytest.org/en/latest/getting-started.html
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[Python track tools page]: https://exercism.org/docs/tracks/python/tools
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[Python track tests page]: https://exercism.org/docs/tracks/python/tests
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[pytest-cache]:http://pythonhosted.org/pytest-cache/
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[pytest-subtests]:https://github.com/pytest-dev/pytest-subtests
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[pytest.ini]: https://github.com/exercism/python/blob/main/pytest.ini
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[pytest: configuration file formats]: https://docs.pytest.org/en/6.2.x/customize.html#configuration-file-formats
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[pytest: marking test functions with attributes]: https://docs.pytest.org/en/6.2.x/mark.html#raising-errors-on-unknown-marks
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[pytest: working with custom markers]: https://docs.pytest.org/en/6.2.x/example/markers.html#working-with-custom-markers
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## Submitting your solution
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You can submit your solution using the `exercism submit resistor_color_expert.py` command.
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This command will upload your solution to the Exercism website and print the solution page's URL.
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It's possible to submit an incomplete solution which allows you to:
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- See how others have completed the exercise
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- Request help from a mentor
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## Need to get help?
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If you'd like help solving the exercise, check the following pages:
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- The [Python track's documentation](https://exercism.org/docs/tracks/python)
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- The [Python track's programming category on the forum](https://forum.exercism.org/c/programming/python)
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- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
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- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
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Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
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Below are some resources for getting help if you run into trouble:
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- [The PSF](https://www.python.org) hosts Python downloads, documentation, and community resources.
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- [The Exercism Community on Discord](https://exercism.org/r/discord)
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- [Python Community on Discord](https://pythondiscord.com/) is a very helpful and active community.
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- [/r/learnpython/](https://www.reddit.com/r/learnpython/) is a subreddit designed for Python learners.
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- [#python on Libera.chat](https://www.python.org/community/irc/) this is where the core developers for the language hang out and get work done.
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- [Python Community Forums](https://discuss.python.org/)
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- [Free Code Camp Community Forums](https://forum.freecodecamp.org/)
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- [CodeNewbie Community Help Tag](https://community.codenewbie.org/t/help)
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- [Pythontutor](http://pythontutor.com/) for stepping through small code snippets visually.
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Additionally, [StackOverflow](http://stackoverflow.com/questions/tagged/python) is a good spot to search for your problem/question to see if it has been answered already.
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If not - you can always [ask](https://stackoverflow.com/help/how-to-ask) or [answer](https://stackoverflow.com/help/how-to-answer) someone else's question.
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# Resistor Color Expert
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Welcome to Resistor Color Expert on Exercism's Python Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Introduction
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If you want to build something using a Raspberry Pi, you'll probably use _resistors_.
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Like the previous [`Resistor Color Duo`][resistor-color-duo-exercise] and [`Resistor Color Trio`][resistor-color-trio-exercise] exercises, you will be translating resistor color bands to human-readable labels.
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- Each resistor has a resistance value.
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- Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read.
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To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values.
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- Each band acts as a digit of a number.
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For example, if they printed a brown band (value 1) followed by a green band (value 5), it would translate to the number 15.
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[resistor-color-duo-exercise]: https://exercism.org/tracks/python/exercises/resistor-color-duo
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[resistor-color-trio-exercise]: https://exercism.org/tracks/python/exercises/resistor-color-trio
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## Instructions
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In this exercise, you are going to create a helpful program so that you don't have to remember the values of the bands.
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The program will take 1, 4, or 5 colors as input and output the correct value in ohms.
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The color bands are encoded as follows:
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- black: 0
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- brown: 1
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- red: 2
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- orange: 3
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- yellow: 4
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- green: 5
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- blue: 6
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- violet: 7
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- grey: 8
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- white: 9
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In [`Resistor Color Trio`][resistor-color-trio-exercise] you decoded the first three color bands.
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For instance: orange-orange-brown translated to the main value `330`.
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In this exercise you will need to add _tolerance_ to the mix.
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Tolerance is the maximum amount that a value can be above or below the main value.
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For example, if the last band is green, the maximum tolerance will be `±0.5%`.
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The tolerance band will have one of these values:
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- grey - 0.05%
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- violet - 0.1%
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- blue - 0.25%
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- green - 0.5%
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- brown - 1%
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- red - 2%
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- gold - 5%
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- silver - 10%
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The four-band resistor is built up like this:
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| Band_1 | Band_2 | Band_3 | band_4 |
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| ------- | ------- | ---------- | --------- |
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| Value_1 | Value_2 | Multiplier | Tolerance |
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Examples:
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- orange-orange-brown-green would be `330` ohms with a `±0.5%` tolerance.
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- orange-orange-red-grey would be `3300` ohms with `±0.05%` tolerance.
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The difference between a four and five-band resistor is that the five-band resistor has an extra band to indicate a more precise value.
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| Band_1 | Band_2 | Band_3 | Band_4 | band_5 |
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| ------- | ------- | ------- | ---------- | --------- |
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| Value_1 | Value_2 | Value_3 | Multiplier | Tolerance |
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Examples:
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- orange-orange-orange-black-green would be `333` ohms with a `±0.5%` tolerance.
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- orange-red-orange-blue-violet would be `323M` ohms with a `±0.10` tolerance.
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There are also one band resistors.
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One band resistors only have the color black with a value of 0.
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Your program should translate an input `list` of resistor band colors into a label:
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"... ohms ...%"
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So an input `list` of `["orange", "orange", "black", "green"]` should return:
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"33 ohms ±0.5%"
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When there are more than a thousand ohms, we say "kiloohms".
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That's similar to saying "kilometer" for 1000 meters, and "kilograms" for 1000 grams.
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So an input `list` of `["orange", "orange", "orange", "grey"]` should return:
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"33 kiloohms ±0.05%"
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When there are more than a million ohms, we say "megaohms".
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So an input `list` of `["orange", "orange", "blue", "red"]` should return:
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"33 megaohms ±2%"
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[resistor-color-trio-exercise]: https://exercism.org/tracks/python/exercises/resistor-color-trio
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## Source
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### Created by
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- @meatball133
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- @bethanyg
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### Based on
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Based on earlier resistor color exercises made by Erik Schierboom and Maud de Vries - https://github.com/exercism/problem-specifications/issues/1464
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def resistor_label(colors):
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band_colors: list = [
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"black",
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"brown",
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"red",
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"orange",
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"yellow",
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"green",
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"blue",
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"violet",
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"grey",
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"white",
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]
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tolerances: dict = {
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"grey": " ±0.05%",
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"violet": " ±0.1%",
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"blue": " ±0.25%",
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"green": " ±0.5%",
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"brown": " ±1%",
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"red": " ±2%",
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"gold": " ±5%",
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"silver": " ±10%",
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}
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band_size: int = len(colors)
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# if band_size > 4 or band_size < 2:
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# print("total number of bands must be between 4 or 5")
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valor_bandas: list[str] = []
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valor_total: float = 0.00
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multiplier: int = 0
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tolerance: str = ""
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metrix_prefix: str
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for band_number, color in enumerate(colors):
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if band_size > 2:
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if band_number == band_size - 2:
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multiplier = band_colors.index(color)
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elif band_number == band_size - 1:
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tolerance = tolerances[color]
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else:
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valor_bandas.append(str(band_colors.index(color)))
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else:
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valor_bandas.append(str(band_colors.index(color)))
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valor_total = int("".join(valor_bandas)) * (10**multiplier)
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# apply sieve to determine metrix prefix
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if valor_total >= 10**9:
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metrix_prefix = "giga"
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valor_total /= 10**9
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elif valor_total >= 10**6:
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metrix_prefix = "mega"
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valor_total /= 10**6
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elif valor_total >= 10**3:
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metrix_prefix = "kilo"
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valor_total /= 10**3
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else:
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metrix_prefix = ""
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return f"{valor_total if valor_total != int(valor_total) else int(valor_total)} {metrix_prefix}ohms{tolerance}"
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import unittest
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from resistor_color_expert import (
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resistor_label,
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)
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# Tests adapted from `problem-specifications//canonical-data.json`
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class ResistorColorExpertTest(unittest.TestCase):
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def test_orange_orange_black_and_red(self):
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self.assertEqual(resistor_label(["orange", "orange", "black", "red"]), "33 ohms ±2%")
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def test_blue_grey_brown_and_violet(self):
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self.assertEqual(resistor_label(["blue", "grey", "brown", "violet"]), "680 ohms ±0.1%")
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def test_red_black_red_and_green(self):
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self.assertEqual(resistor_label(["red", "black", "red", "green"]), "2 kiloohms ±0.5%")
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def test_green_brown_orange_and_grey(self):
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self.assertEqual(
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resistor_label(["green", "brown", "orange", "grey"]), "51 kiloohms ±0.05%"
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)
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def test_one_black_band(self):
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self.assertEqual(resistor_label(["black"]), "0 ohms")
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def test_orange_orange_yellow_black_and_brown(self):
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self.assertEqual(
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resistor_label(["orange", "orange", "yellow", "black", "brown"]), "334 ohms ±1%"
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)
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def test_red_green_yellow_yellow_and_brown(self):
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self.assertEqual(
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resistor_label(["red", "green", "yellow", "yellow", "brown"]), "2.54 megaohms ±1%"
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)
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def test_blue_grey_white_brown_and_brown(self):
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self.assertEqual(
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resistor_label(["blue", "grey", "white", "brown", "brown"]), "6.89 kiloohms ±1%"
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)
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def test_violet_orange_red_and_grey(self):
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self.assertEqual(
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resistor_label(["violet", "orange", "red", "grey"]), "7.3 kiloohms ±0.05%"
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)
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def test_brown_red_orange_green_and_blue(self):
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self.assertEqual(
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resistor_label(["brown", "red", "orange", "green", "blue"]), "12.3 megaohms ±0.25%"
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)
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def test_brown_black_brown_yellow_and_violet(self):
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self.assertEqual(
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resistor_label(["brown", "black", "brown", "yellow", "violet"]), "1.01 megaohms ±0.1%"
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)
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def test_brown_black_red_and_red(self):
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self.assertEqual(
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resistor_label(["brown", "black", "red", "red"]), "1 kiloohms ±2%"
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)
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