input: Write a python function to generate the first n Fibonacci numbers.
  assert Fibonacci(7) == [0, 1, 1, 2, 3, 5, 8]
  assert Fibonacci(10) == [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
  assert Fibonacci(5) == [0, 1, 1, 2, 3]
output: def Fibonacci(n):
      if n <= 0:
          return []
      elif n == 1:
          return [0]
      elif n == 2:
          return [0, 1]
      
      fib_sequence = [0, 1]
      while len(fib_sequence) < n:
          fib_sequence.append(fib_sequence[-1] + fib_sequence[-2])
      
      return fib_sequence