input: def compress_sequence(nums):
      """ Compresses a given data sequence by grouping consecutive numbers of the same sign together.
      Each group is represented as a separate list within the resulting list.
      
      >>> compress_sequence([9, -2, 6, 0, -7])
      [[9], [-2], [6, 0], [-7]]
      """
      
      output = []
      temp = [nums[0]]
  
      for i in range(1, len(nums)):
          if nums[i-1] * nums[i] >= 0:
              temp.append(nums[i])
          else:
              output.append(temp)
              temp = [nums[i]]
      output.append(temp)
  
      return output
output:     output = []
      temp = [nums[0]]
  
      for i in range(1, len(nums)):
          if nums[i-1] * nums[i] >= 0:
              temp.append(nums[i])
          else:
              output.append(temp)
              temp = [nums[i]]
      output.append(temp)
  
      return output