but if to change the whole file, it will take very long time,
so I just want to change n(n is an int) bytes of the file.
but when I turned to the file I/O of python, I found that file object can only read and write strings,
so how can I do the binary stuff?
I want a encrypt function like below:
def encrypt(filename,n):
f=open(filename,"rb")
a=f.read(n)
//encrypt the n byte bit by bit and then write back to the beginning of the file
//assume I only want every bit change from 0->1 and 1->0, how to do it than?
Thank you so much!
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