正向打印的时候
for i in range(2): print(i) 打印的结果 0 1
反向的时候
for i in range(2,-1,-1): print(i) 2 1 0
for i in range(3,0,-1):
print(i)
3
2
1
0
-1
正向打印的时候
for i in range(2): print(i) 打印的结果 0 1
反向的时候
for i in range(2,-1,-1): print(i) 2 1 0
for i in range(3,0,-1):
print(i)
3
2
1
0
-1