写一个1和0的字符串到二进制文件？

I want to take a string of 1's and 0's and convert it into an actual binary file(simply writing the string of 1's and 0's to a file would just make it either ascii file containing "00110001"s and "00110000"s ). I would prefer to do this in python or directly from a bash shell, but java or C is fine too. this is probably a one time use. I want to take a string of 1's and 0's and conv