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68 lines
2.7 KiB
Markdown
68 lines
2.7 KiB
Markdown
# Space Age
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Given an age in seconds, calculate how old someone would be on:
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- Earth: orbital period 365.25 Earth days, or 31557600 seconds
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- Mercury: orbital period 0.2408467 Earth years
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- Venus: orbital period 0.61519726 Earth years
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- Mars: orbital period 1.8808158 Earth years
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- Jupiter: orbital period 11.862615 Earth years
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- Saturn: orbital period 29.447498 Earth years
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- Uranus: orbital period 84.016846 Earth years
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- Neptune: orbital period 164.79132 Earth years
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So if you were told someone were 1,000,000,000 seconds old, you should
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be able to say that they're 31.69 Earth-years old.
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If you're wondering why Pluto didn't make the cut, go watch [this
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youtube video](http://www.youtube.com/watch?v=Z_2gbGXzFbs).
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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 space_age_test.py`
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- Python 3.4+: `pytest space_age_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 space_age_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/space-age` 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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Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial. [http://pine.fm/LearnToProgram/?Chapter=01](http://pine.fm/LearnToProgram/?Chapter=01)
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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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