Add spiral-matrix (exercism#1170)

* [WIP] Add spiral-matrix * Implement exercise spiral-matrix * Fix trailing whitespace and missing blank lines * Add exercise to config.json * Fix typo in config.json * Delete topic "logic" for spiral-matrix * Add reference to canonical data * Fix issue with missing blank line * Add blank line

Author: chgraef

config.json

@@ -1280,6 +1280,18 @@
 "sets"
  ]
  },
+{
+"uuid": "b0c7cf95-6470-4c1a-8eaa-6775310926a2",
+"slug": "spiral-matrix",
+"core": false,
+"unlocked_by": null,
+"difficulty": 2,
+"topics": [
+"algorithms",
+"control-flow",
+"lists"
+ ]
+ },
 {
 "uuid": "e7351e8e-d3ff-4621-b818-cd55cf05bffd",
 "slug": "accumulate",

exercises/spiral-matrix/README.md

@@ -0,0 +1,42 @@
+# Spiral Matrix
+
+
+Given the size, return a square matrix of numbers in spiral order.
+
+The matrix should be filled with natural numbers, starting from 1
+in the top-left corner, increasing in an inward, clockwise spiral order,
+like these examples:
+
+##### Spiral matrix of size 3
+
+```plain
+1 2 3
+8 9 4
+7 6 5
+```
+
+##### Spiral matrix of size 4
+
+```plain
+ 1 2 3 4
+12 13 14 5
+11 16 15 6
+10 9 8 7
+```
+
+## Submitting Exercises
+
+Note that, when trying to submit an exercise, make sure the solution is in the `exercism/python/<exerciseName>` directory.
+
+For example, if you're submitting `bob.py` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/python/bob/bob.py`.
+
+For more detailed information about running tests, code style and linting,
+please see the [help page](http://exercism.io/languages/python).
+
+## Source
+
+Reddit r/dailyprogrammer challenge #320[Easy] Spiral Ascension. [https://www.reddit.com/r/dailyprogrammer/comments/6i60lr/20170619_challenge_320_easy_spiral_ascension/](https://www.reddit.com/r/dailyprogrammer/comments/6i60lr/20170619_challenge_320_easy_spiral_ascension/)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.
+

exercises/spiral-matrix/example.py

@@ -0,0 +1,11 @@
+defspiral(size):
+sm= [[0]*sizeforkinrange(size)]
+i, j, el=0, -1, 1
+di, dj= [0, 1, 0, -1], [1, 0, -1, 0]
+forxinrange(2*size-1):
+foryinrange((2*size-x) //2):
+i+=di[x%4]
+j+=dj[x%4]
+sm[i][j] =el
+el+=1
+returnsm

exercises/spiral-matrix/spiral_matrix.py

@@ -0,0 +1,2 @@
+defspiral(size):
+pass

exercises/spiral-matrix/spiral_matrix_test.py

@@ -0,0 +1,40 @@
+importunittest
+
+fromspiral_matriximportspiral
+
+
+# Tests adapted from `problem-specifications//canonical-data.json` @ v1.1.0
+
+
+classSpiralMatrixTest(unittest.TestCase):
+deftest_spiral_matrix_with_size_0(self):
+self.assertEqual(spiral(0), [])
+
+deftest_spiral_matrix_with_size_1(self):
+self.assertEqual(spiral(1), [[1]])
+
+deftest_spiral_matrix_with_size_2(self):
+self.assertEqual(spiral(2), [[1, 2],
+ [4, 3]])
+
+deftest_spiral_matrix_with_size_3(self):
+self.assertEqual(spiral(3), [[1, 2, 3],
+ [8, 9, 4],
+ [7, 6, 5]])
+
+deftest_spiral_matrix_with_size_4(self):
+self.assertEqual(spiral(4), [[1, 2, 3, 4],
+ [12, 13, 14, 5],
+ [11, 16, 15, 6],
+ [10, 9, 8, 7]])
+
+deftest_spiral_matrix_with_size_5(self):
+self.assertEqual(spiral(5), [[1, 2, 3, 4, 5],
+ [16, 17, 18, 19, 6],
+ [15, 24, 25, 20, 7],
+ [14, 23, 22, 21, 8],
+ [13, 12, 11, 10, 9]])
+
+
+if__name__=='__main__':
+unittest.main()