input: Write a function to output the Fibonacci sequence as a list of integers in Python. The function should take an integer `n` as input and return a list containing the first `n` Fibonacci numbers.
  assert fibonacci_sequence(5) == [0, 1, 1, 2, 3]
  assert fibonacci_sequence(1) == [0]
  assert fibonacci_sequence(0) == []
  assert fibonacci_sequence(10) == [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
  assert fibonacci_sequence(2) == [0, 1]
output: def fibonacci_sequence(n):
      if n == 0:
          return []
      elif n == 1:
          return [0]
      fib_seq = [0, 1]
      for i in range(2, n):
          fib_seq.append(fib_seq[-1] + fib_seq[-2])
      return fib_seq