Write a function to solve alphametics puzzles.
Alphametics is a puzzle where letters in words are replaced with numbers.
For example SEND + MORE = MONEY:
S E N D
M O R E +
-----------
M O N E Y
Replacing these with valid numbers gives:
9 5 6 7
1 0 8 5 +
-----------
1 0 6 5 2
This is correct because every letter is replaced by a different number and the words, translated into numbers, then make a valid sum.
Each letter must represent a different digit, and the leading digit of a multi-digit number must not be zero.
Write a function to solve alphametics puzzles.
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 alphametics_test.py
Alternatively, you can tell Python to run the pytest module:
python -m pytest alphametics_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/alphametics 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.
It's possible to submit an incomplete solution so you can see how others have completed the exercise.