Add puzzles and puzzles.py from the old branch

puzzles.py

@@ -0,0 +1,34 @@
+#!env python3
+# Eryn Wells <eryn@erynwells.me>
+'''
+Parser for puzzles in the ./puzzles directory.
+'''
+
+import sudoku
+
+euler = []
+norvig = []
+
+def parse_puzzle_files():
+    global euler, norvig
+
+    print('Parsing Euler puzzles')
+    euler = list(_get_puzzles('puzzles/euler.txt'))
+
+    print('Parsing Norvig puzzles')
+    norvig = list(_get_puzzles('puzzles/norvig.txt'))
+
+def _get_puzzles(filename):
+    with open(filename, 'r') as f:
+        puzzles = f.readlines()
+    return (_parse_puzzle(p) for p in puzzles if p)
+
+def _parse_puzzle(puzzle):
+    puzzle = puzzle.strip()
+    if len(puzzle) == 81:
+        print("Parsing  '{}'".format(puzzle))
+        board = (int('0' if x == '.' else x) for x in puzzle)
+        return sudoku.Sudoku(initial=board)
+    else:
+        print("Skipping '{}'".format(puzzle))
+        return None