python的程序填空

#!/usr/bin/python
# -*- coding: UTF-8 -*-
"""
@author: YangPC
@time:2021/06/18
@QQ:327844761
@微信公众号：ewbang
"""

if __name__ == '__main__':
    s1 = "my python program    ";
    s2 = s1.rstrip()
    print(s2)
    print(s2.upper())
    s3 = s2.replace(" ", ",")
    print(s3)
    print(s3[3:9])
    ls = s3.split(',')
    print(ls)

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