python中居然没有转换10/16进制数为二进制的函数？

slawdan

呃…………

def dec_to_bin(x):
    c,m = list(oct(x)), ['000','001','010','011','100','101','110','111']
    return str(int(''.join([m[int(i)] for i in c])))

>>>  dec_to_bin(20)
'10100'

直接对应就可以了~

chunchengfh

自己找了一下，从What’s New In Python 3.0（http://docs.python.org/3.0/whatsnew/3.0.html）中看到这样一句话：
Bytes literals are introduced with a leading b or B, and there is a new corresponding builtin function, bin().