字符串函数举例 a=qwerty pl rint a qwerty b=left(a, 2) print b qW c=right(a, 3) print c <<> 2021/2222021/2/22 7 字符串函数举例 a="qwertyu" print a qwertyu b=left(a,2) print b qw c=right(a,3) print c tyu j