python的[:-1]和[::-1]用法及结果实例取反、删除末尾字符串

1. [::-1]  取反

a = "abcdef"
print (a[::-1])


结果：fedcba

2. [:-1] 删除最后一位

a = "abcdef"
print (a[:-1])



结果：abcde