upper() 转换为大写
test='alex' v1=test.upper() print(v1)
ALEX
2.输出格式与填充
2.1 center() 字符串居中显示,指定字符总数并设定空白处填充字符
test = "aleX" v1 = test.center(20,"*") print(v1)
********aleX********
2.2 ljust() 字符串居左
test='alex' v2 = test.ljust(20,"*") print(v2)
aleX****************
2.3rjust()字符串居右
test='alex' v3=test.rjust(20,"*") print(v3)
****************
alex
2.4 zfill() 字符串居右并填充“0”
test='alex' v4=test.zfill(20) print(v4)
0000000000000000alex