此单行代码适用于：
>>> ''.join(['%08d'%int(bin(ord(i))[2:]) for i in 'This is my string'])
'0101010001101000011010010111001100100000011010010111001100100000011011010111100100100000011100110111010001110010011010010110111001100111'
你可以bin()自己写
def bin(x):
if x==0:
return '0'
else:
return (bin(x/2)+str(x%2)).lstrip('0') or '0'
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