text: import os
  import numpy as np
  
  
  def createFile(filename, content, wmode='w'):
      try:
          with open(filename, wmode) as file:
              file.write(content)
      except Exception as e:
          return "Error :", e
      return True
  
  
  def readFile(filename, rmode='r'):
      try:
          with open(filename, rmode) as file:
              content = file.read()
      except Exception as e:
          return "Error :", e
      return content
  
  
  
  def scan_directory(dirname):
      files = []
      for filename in os.listdir(dirname):
          files.append(os.path.join(dirname, filename))
      return files
  
  
  def MED(A, B):
      m = len(A)
      n = len(B)
      D = np.zeros((m + 1, n + 1))
      for i in range(1, m + 1):
          D[i, 0] = i
      for j in range(1, n + 1):
          D[0, j] = j
      for i in range(1, m + 1):
          for j in range(1, n + 1):
              if A[i - 1] == B[j - 1]:
                  alpha = 0
              else:
                  alpha = 2
  
              D[i, j] = min(D[i - 1, j] + 1,
                            D[i, j - 1] + 1, D[i - 1, j - 1] + alpha)
      # print(D[1:])
      return D[m, n]
  
  