1 files changed, 93 insertions, 0 deletions
diff --git a/challenge-337/packy-anderson/python/ch-2.py b/challenge-337/packy-anderson/python/ch-2.py
new file mode 100755
index 0000000000..929d78930a
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+++ b/challenge-337/packy-anderson/python/ch-2.py
@@ -0,0 +1,93 @@
+#!/usr/bin/env python
+
+def displayTwo(display1, display2):
+  display = []
+  # split the two strings and join each row together
+  for d1,d2 in zip(display1.split("\n"), display2.split("\n")):
+    display.append(d1 + d2)
+  return "\n".join(display)
+
+def displayMatrix(label, matrix):
+  width = (len(matrix[0]) + 2) * 2 + 1
+  display = label.ljust(width) + "\n"
+  for r in range(len(matrix)):
+    display += "[ " + int_join(" ",matrix[r]) + " ]  \n"
+  return display
+
+def emptyMatrix(row, col):
+  matrix = []
+  for r in range(row):
+    matrix.append([])
+    for c in range(col):
+      matrix[r].append(0)
+  return matrix
+
+def incrementRow(row, matrix):
+  for col in range(len(matrix[0])):
+    matrix[row][col] += 1
+  return matrix
+
+def incrementCol(col, matrix):
+  for row in range(len(matrix)):
+    matrix[row][col] += 1
+  return matrix
+
+def countOdd(matrix):
+  count = 0
+  for row in range(len(matrix)):
+    for col in range(len(matrix[0])):
+      if matrix[row][col] % 2: count += 1
+  return count
+
+def odd_matrix(row, col, locations):
+  matrix = emptyMatrix(row, col)
+  display = displayMatrix("Initial:", matrix)
+  for row,col in locations:
+    display += f"\nApply [{row},{col}]:\n"
+
+    display += f"Increment row {row}:\n"
+    before = displayMatrix("Before", matrix)
+    matrix = incrementRow(row, matrix)
+    after = displayMatrix("After", matrix)
+    display += displayTwo(before, after)
+
+    display += f"Increment col {col}:\n"
+    before = displayMatrix("Before", matrix)
+    matrix = incrementCol(col, matrix)
+    after = displayMatrix("After", matrix)
+    display += displayTwo(before, after)
+  display += "\n"
+  return(
+    countOdd(matrix),
+    display + displayMatrix('Final:', matrix)
+  )
+
+def int_join(joiner, arr):
+  return joiner.join(map(lambda i: str(i), arr))
+
+def solution(row, col, locations):
+  loc_list = ",".join([
+    f"[{int_join(',', x)}]" for x in locations
+  ])
+  print(
+    f'Input: $row = {row}, $col = {col}, ' +
+    f'@locations = ({loc_list})'
+  )
+  odd, explain = odd_matrix(row, col, locations)
+  print(f'Output: {odd}\n\n{explain}')
+
+
+print('Example 1:')
+solution(2, 3, [[0,1],[1,1]])
+
+print('\nExample 2:')
+solution(2, 2, [[1,1],[0,0]])
+
+print('\nExample 3:')
+solution(3, 3, [[0,0],[1,2],[2,1]])
+
+print('\nExample 4:')
+solution(1, 5, [[0,2],[0,4]])
+
+print('\nExample 5:')
+solution(4, 2, [[1,0],[3,1],[2,0],[0,1]])