字符串逆序转换

#!/usr/bin/python

string="Please covert this strings in some way."

invert_seq=string[::-1]
upper_str1_invert=invert_seq.upper()
upper_str2_sort=string.upper()

print string
print invert_seq
print upper_str1_invert
print upper_str2_sort

输出结果：

Please covert this strings in some way.
.yaw emos ni sgnirts siht trevoc esaelP
.YAW EMOS NI SGNIRTS SIHT TREVOC ESAELP
PLEASE COVERT THIS STRINGS IN SOME WAY.

a=string[::-1]:将字符串变量string中的所有字符逆序后赋值给a;
b=string.upper():使用方法upper将string的所有字符转换为大写，赋给b;
string.lower():使用方法lower将string的所有字符转换为小写。

小知识：
清屏需要引入os模块
os.system('clear')