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99 lines
3.0 KiB
Markdown
99 lines
3.0 KiB
Markdown
# Matrix
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Given a string representing a matrix of numbers, return the rows and columns of
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that matrix.
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So given a string with embedded newlines like:
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```text
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9 8 7
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5 3 2
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6 6 7
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```
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representing this matrix:
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```text
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1 2 3
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|---------
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1 | 9 8 7
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2 | 5 3 2
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3 | 6 6 7
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```
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your code should be able to spit out:
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- A list of the rows, reading each row left-to-right while moving
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top-to-bottom across the rows,
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- A list of the columns, reading each column top-to-bottom while moving
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from left-to-right.
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The rows for our example matrix:
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- 9, 8, 7
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- 5, 3, 2
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- 6, 6, 7
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And its columns:
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- 9, 5, 6
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- 8, 3, 6
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- 7, 2, 7
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In this exercise you're going to create a **class**. _Don't worry, it's not as complicated as you think!_
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- [**A First Look at Classes**](https://docs.python.org/3/tutorial/classes.html#a-first-look-at-classes) from the Python 3 documentation.
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- [**How to Define a Class in Python**](https://realpython.com/python3-object-oriented-programming/#how-to-define-a-class-in-python) from the Real Python website.
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- [**Data Structures in Python**](https://docs.python.org/3/tutorial/datastructures.html) from the Python 3 documentation.
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## Exception messages
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Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to
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indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not
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every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include
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a message.
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To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
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`raise Exception`, you should write:
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```python
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raise Exception("Meaningful message indicating the source of the error")
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```
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## Running the tests
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To run the tests, run the appropriate command below ([why they are different](https://github.com/pytest-dev/pytest/issues/1629#issue-161422224)):
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- Python 2.7: `py.test matrix_test.py`
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- Python 3.4+: `pytest matrix_test.py`
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Alternatively, you can tell Python to run the pytest module (allowing the same command to be used regardless of Python version):
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`python -m pytest matrix_test.py`
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### Common `pytest` options
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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 other options, see `python -m pytest -h`
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## Submitting Exercises
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Note that, when trying to submit an exercise, make sure the solution is in the `$EXERCISM_WORKSPACE/python/matrix` directory.
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You can find your Exercism workspace by running `exercism debug` and looking for the line that starts with `Workspace`.
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For more detailed information about running tests, code style and linting,
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please see [Running the Tests](http://exercism.io/tracks/python/tests).
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## Source
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Warmup to the `saddle-points` warmup. [http://jumpstartlab.com](http://jumpstartlab.com)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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