def count_factors():
    n = int(input('input the num:'))
    num = n
    res = []
    while n > 1:
        for i in range(2, n+1):
            if n % i == 0:
                n = int(n/i)
                res.append(i)
                break
    print('{}={}'.format(num, res))

输出:

input the num:90
90=[2, 3, 3, 5]

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