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

''' mbinary
#########################################################################
# File : num_weight.py
# Author: mbinary
# Mail: zhuheqin1@gmail.com
# Blog: https://mbinary.xyz
# Github: https://github.com/mbinary
# Created Time: 2018-05-19  21:36
# Description:
#########################################################################
'''


def covert(s, basefrom=10, baseto=2):
    return d2n(n2d(s, basefrom), baseto)


def n2d(s, base=16):
    ''' num of base_n(n<36) to decimal'''
    dic = {chr(i+ord('0')): i for i in range(10)}
    s = s.upper()
    if base > 10:
        dic.update({chr(i+ord('A')): i+10 for i in range(26)})
    # if base in [16,8,2] :
    #    p=max(map(s.find,'OBX'))
    #   s=s[p+1:] #remove prefix of hex or bin or oct
    rst = 0
    for i in s:
        rst = dic[i]+rst*base
    return rst


def d2n(n, base=16):
    ''' num of base_n(n<36) to decimal'''
    dic = {i: chr(i+ord('0')) for i in range(10)}
    if base > 10:
        dic.update({i+10: chr(i+ord('A')) for i in range(26)})
    rst = []
    while n != 0:
        i = int(n/base)
        rst.append(dic[n-i*base])
        n = i
    return ''.join(rst[::-1])


'''
>>> n2d(str(d2n(4001)))
4001
>>> d2n(n2d(str(4001)),2)
'100000000000001'
>>> covert('4001',16,2)
'100000000000001' 
'''