input: 
  from typing import List
  
  
  def calculate_fibonacci_sequence(n: int) -> List[int]:
      """ Calculate the first 'n' numbers of the Fibonacci sequence.
      >>> calculate_fibonacci_sequence(0)
      []
      >>> calculate_fibonacci_sequence(1)
      [0]
      >>> calculate_fibonacci_sequence(2)
      [0, 1]
      >>> calculate_fibonacci_sequence(9)
      [0, 1, 1, 2, 3, 5, 8, 13, 21]
      """
      if n <= 0:
          return []
      elif n == 1:
          return [0]
      elif n == 2:
          return [0, 1]
      
      sequence = [0, 1]
      for i in range(2, n):
          sequence.append(sequence[-1] + sequence[-2])
      
      return sequence
  
  # Driver Code
  print(calculate_fibonacci_sequence(9))
  
output:     if n <= 0:
          return []
      elif n == 1:
          return [0]
      elif n == 2:
          return [0, 1]
      
      sequence = [0, 1]
      for i in range(2, n):
          sequence.append(sequence[-1] + sequence[-2])
      
      return sequence