1. reversed()
a = [1, 2, 3, 4]
for i in reversed(a):
print(i)
2. range(len(a)-1, -1, -1)
a = [1, 2, 3, 4]
for i in range(len(a)-1, -1, -1):
print(a[i])
3. range(len(a)) + ~操作符
~按位取反运算符：对数据的每个二进制位取反,即把1变为0,把0变为1 。~x 类似于 -x-1
a = [1, 2, 3, 4]
for i in range(len(a)):
print(a[~i])
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4. slice
a = [1, 2, 3, 4]
for i in a[::-1]:
print(i)
5. length-i-1
a = [1, 2, 3, 4]
seq_length = len(a)
for i in range(seq_length):