Given a moment, determine the moment that would be after a gigasecond has passed.
A gigasecond is 10^9 (1,000,000,000) seconds.
Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include a message.
To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
raise Exception, you should write:
raise Exception("Meaningful message indicating the source of the error")
To run the tests, run
Alternatively, you can tell Python to run the pytest module:
python -m pytest gigasecond_test.py
-v: enable verbose output
-x: stop running tests on first failure
--ff: run failures from previous test before running other test cases
For other options, see
python -m pytest -h
Note that, when trying to submit an exercise, make sure the solution is in the
You can find your Exercism workspace by running
exercism debug and looking for the line that starts with
For more detailed information about running tests, code style and linting, please see Running the Tests.
Chapter 9 in Chris Pine's online Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=09
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
from datetime import datetime import unittest from gigasecond import add # Tests adapted from `problem-specifications//canonical-data.json` class GigasecondTest(unittest.TestCase): def test_date_only_specification_of_time(self): self.assertEqual( add(datetime(2011, 4, 25, 0, 0)), datetime(2043, 1, 1, 1, 46, 40) ) def test_second_test_for_date_only_specification_of_time(self): self.assertEqual( add(datetime(1977, 6, 13, 0, 0)), datetime(2009, 2, 19, 1, 46, 40) ) def test_third_test_for_date_only_specification_of_time(self): self.assertEqual( add(datetime(1959, 7, 19, 0, 0)), datetime(1991, 3, 27, 1, 46, 40) ) def test_full_time_specified(self): self.assertEqual( add(datetime(2015, 1, 24, 22, 0)), datetime(2046, 10, 2, 23, 46, 40) ) def test_full_time_with_day_roll_over(self): self.assertEqual( add(datetime(2015, 1, 24, 23, 59, 59)), datetime(2046, 10, 3, 1, 46, 39) ) if __name__ == "__main__": unittest.main()
from datetime import timedelta, datetime GIGASECOND = 10 ** 9 def add(moment: datetime) -> datetime: return moment + timedelta(seconds=GIGASECOND)
A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.
Here are some questions to help you reflect on this solution and learn the most from it.