无法使用 for 循环

Question

** 我想使用两个 for-loops 而不是两个 while-loops **

i = 7
while i >= 1:
    j = i
    while j <= 7:
        print(j, end ="  ")
        J += 1
    i -= 1
    print()

Answer 1

以下是 for-loop 等价物：

for i in range(7, 0, -1):
    j = i
    for j in range(i, 8):
        print(j, end="  ")
    print()

关键是正确使用range(start, stop, step). See also this。