algorithm-in-python/math/numWeight/nega.py

''' mbinary
#########################################################################
# File : nega.py
# Author: mbinary
# Mail: zhuheqin1@gmail.com
# Blog: https://mbinary.xyz
# Github: https://github.com/mbinary
# Created Time: 2019-06-02  23:15
# Description:
#########################################################################
'''


def nega(n: int, base=-2: int)->: list:
    '''return list of num, the first is the highest digit'''
    if base > -2:
        raise Exception(
            f"[Error]: invalid base: {base}, base should be no more than -2")
    ans = []
    while n:
        k = n % base
        if k < 0:
            k -= base
        ans.append(k)
        n = (n-k)//base
    return ans[::-1]