10進数 to 2進数

In [1]: def dec2bin(target):
   ...:     remainder = []
   ...:     while target != 0:
   ...:         remainder.append(target % 2)
   ...:         target = target // 2
   ...:     remainder.reverse()
   ...:     return remainder
   ...: 

In [2]: dec2bin(124)
Out[2]: [1, 1, 1, 1, 1, 0, 0]