如何提取每一位上的数

X＝8631840568843578554提取出X每一位的数字

a = 8631840568843578554
ls = []
while a:
    b = a % 10
    ls.append(b)
    a = a//10

print(ls[::-1])

整数？整数的话也可以这样
[int(i) for i in str(X)]
或者
list(map(int, str(X)))
例如

a = 123456789
print(list(map(int, str(a))))
[1, 2, 3, 4, 5, 6, 7, 8, 9]
print([int(i) for i in str(a)])
[1, 2, 3, 4, 5, 6, 7, 8, 9]