code: def imeicsum(text):
      '''
      Calculate the imei check byte.
      '''
      digs = []
      for i in range(14):
  
          v = int(text[i])
          if i % 2:
              v *= 2
  
          [digs.append(int(x)) for x in str(v)]
  
      chek = 0
      valu = sum(digs)
      remd = valu % 10
      if remd != 0:
          chek = 10 - remd
  
      return str(chekf imeicsum(text):
      '''
      Calculate the imei check byte.
      '''
      digs = []
      for i in range(14):
  
          v = int(text[i])
          if i % 2:
              v *= 2
  
          [digs.append(int(x)) for x in str(v)]
  
      chek = 0
      valu = sum(digs)
      remd = valu % 10
      if remd != 0:
          chek = 10 - remd
  
      return str(chek)
docs: Calculate the imei check byte.