Leetcode 54 - spiral matrix - study code - provided by the peer - python code

Leetcode54_spiralMatrix_StudyCode.py

def spiral_copy(inputMatrix):
  size = len(inputMatrix) * len(inputMatrix[0])
  results = []
  layer = 0 
  while len(results) < size:
    traverse_right(inputMatrix, layer, results)
    if len(results) >= size:
      return results
    traverse_down(inputMatrix, layer, results)
    if len(results) >= size:
      return results

    traverse_left(inputMatrix, layer, results)
    if len(results) >= size:
      return results

    traverse_up(inputMatrix, layer, results)
    if len(results) >= size:
      return results

    layer += 1
  
  return results

def traverse_right(matrix, layer, results):
  for c in range(layer, len(matrix[layer]) - layer):
    results.append(matrix[layer][c])

def traverse_down(matrix, layer, results):
  size = len(matrix)
  c = len(matrix[0]) - 1 - layer
  for r in range(layer + 1, size - layer):
    results.append(matrix[r][c])
    
def traverse_left(matrix, layer, results):
  size = len(matrix) - 1
  r = size - layer
  for c in reversed(range(layer, len(matrix[0]) - (layer + 1))):
    results.append(matrix[r][c])
    
def traverse_up(matrix, layer, results):
  size = len(matrix)
  c = layer
  for r in reversed(range(layer + 1, size - (layer + 1))):
    results.append(matrix[r][c])