Question

所以我正在玩一个标签树。

 #Ask user to enter number of tree rows
    Height=int(input("Enter height of tree: "))
    hashes = 1
    while Height >0:
        print(' ' * (Height-1) + "#" * (hashes))
        Height -=1
        hashes +=2
    #print a stump(hash)
    print(" " * (Height) + "#")

对于最后一次打印，Height变量中指定的值似乎为0.它保持值在while循环中递减。如何在while循环回到初始值后重置它？

Answer 1

在循环之前保存其值：

    Height=int(input("Enter height of tree: "))
    hashes = 1
    h = Height
    while Height >0:
        print(' ' * (Height-1) + "#" * (hashes))
        Height -=1
        hashes +=2
    #print a stump(hash)
    print(" " * (h-1) + "#")

Answer 2

不使用while循环，而是使用单独的循环变量循环range(Height-1, -1, -1)

height = int(input("Enter height of tree: "))
for hashes, curr_height in enumerate(range(height-1, -1, -1)):
    print((' ' * curr_height) + ('#' * (2*hashes + 1)))
print(' ' * (height-1) + '#')

如何在while循环后将变量重置为初始值

2 个答案: