1：十进制转二进制,转八进制，转十六进制
python
num = 10
b = bin(num)
o = oct(num)
h = hex(num)2：N进制数向十进制转换
十六进制转十进制
python
h = 'a'
n = int(h,16)八进制转十进制
python
o = '7'
n = int(o,8)二进制转十进制
python
b = '0101'
n = int(b,2)