Python zfill() 和 rjust()方法
Python rjust()方法
https://www.runoob.com/python/att-string-rjust.html
Python zfill()方法
https://www.runoob.com/python/att-string-zfill.html
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Python rjust()方法
https://www.runoob.com/python/att-string-rjust.html
Python zfill()方法
https://www.runoob.com/python/att-string-zfill.html