python基础知识-列表的排序问题

def main():
    f=[‘orange‘,‘zoo‘,‘apple‘,‘internationalization‘,‘blueberry‘]

    #python 内置的排序方式默认为升序（从小到大）
    #如果想要降序  用reverse参数来制定
    #python中的函数几乎没有副作用的函数
    #调用函数之后不会影响传入的参数
     f2 = sorted (f,reverse=True)
     print(f)
     print(f2)
     f.reverse()
     f3=(reversed(f))
     print(f3)
    f4=sorted(f,key=str_len,reverse=True)
    print(f4)
结果：
[‘orange‘, ‘zoo‘, ‘apple‘, ‘internationalization‘, ‘blueberry‘]
[‘zoo‘, ‘orange‘, ‘internationalization‘, ‘blueberry‘, ‘apple‘]
<list_reverseiterator object at 0x000000000259E9B0>
[‘internationalization‘, ‘blueberry‘, ‘orange‘, ‘apple‘, ‘zoo‘]

def fib1(n):     d=[1,1]     for num in range (2,n):         val=d[num-1]+d[num-2]         d.append(val)     print(d)     print(d[::2])     print(d[-1:-3:-1])     d.reverse()     print(d) if __name__ == ‘__main__‘:     fib1(20) 结果： [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765] [1, 2, 5, 13, 34, 89, 233, 610, 1597, 4181] [6765, 4181] [6765, 4181, 2584, 1597, 987, 610, 377, 233, 144, 89, 55, 34, 21, 13, 8, 5, 3, 2, 1, 1]