input: Write a function to output the Fibonacci sequence as a list of integers in Python of length n. If n is less than or equal to 0, return an empty list.
  def fibonacci_sequence(n):
      if n <= 0:
          return []
      
      fib_list = [0] * n
      fib_list[0] = 0
      
      if n > 1:
          fib_list[1] = 1
          for i in range(2, n):
              fib_list[i] = fib_list[i-1] + fib_list[i-2]
      
      return fib_list
  
  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(-1)==[]
output: def fibonacci_sequence(n):
      if n <= 0:
          return []
      
      fib_list = [0] * n
      fib_list[0] = 0
      
      if n > 1:
          fib_list[1] = 1
          for i in range(2, n):
              fib_list[i] = fib_list[i-1] + fib_list[i-2]
      
      return fib_list