Given an input text output it transposed.
Roughly explained, the transpose of a matrix:
ABC
DEF
is given by:
AD
BE
CF
Rows become columns and columns become rows. See https://en.wikipedia.org/wiki/Transpose.
If the input has rows of different lengths, this is to be solved as follows:
- Pad to the left with spaces.
- Don't pad to the right.
Therefore, transposing this matrix:
ABC
DE
results in:
AD
BE
C
And transposing:
AB
DEF
results in:
AD
BE
F
In general, all characters from the input should also be present in the transposed output. That means that if a column in the input text contains only spaces on its bottom-most row(s), the corresponding output row should contain the spaces in its right-most column(s).
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 pytest transpose_test.py
Alternatively, you can tell Python to run the pytest module:
python -m pytest transpose_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 $EXERCISM_WORKSPACE/python/transpose
directory.
You can find your Exercism workspace by running exercism debug
and looking for the line that starts with Workspace
.
For more detailed information about running tests, code style and linting, please see Running the Tests.
Reddit r/dailyprogrammer challenge #270 [Easy]. https://www.reddit.com/r/dailyprogrammer/comments/4msu2x/challenge_270_easy_transpose_the_input_text
It's possible to submit an incomplete solution so you can see how others have completed the exercise.