a += [''] * (N - len(a))
或者如果您不想更改a位置
new_a = a + [''] * (N - len(a))
class MyList(list):
def ljust(self, n, fillvalue=''):
return self + [fillvalue] * (n - len(self))
a = MyList(['1'])
b = a.ljust(5, '')
一些内置在python中填充列表的功能
一些内置在python中填充列表的功能
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