x=‘{0}{0}{0}‘.format(‘a‘) print(x) class Date: def __init__(self,year,mon,day): self.year=year self.mon=mon self.day=day d1=Date(2099,1,2) y=‘{0.year}{0.mon}{0.day}‘.format(d1) z=‘{0.year}-{0.mon}-{0.day}‘.format(d1) print(y) print(z)
>>>>
aaa
209912
2099-1-2
原文：https://www.cnblogs.com/python1988/p/11442406.html