"could ildg" wrote: > I want to encrypt a very large birany file, > 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?
8-bit strings contain bytes. > I want a encrypt function like below: > def encrypt(filename,n): f = open(filename,"rb+") > a=f.read(n) b = encrypt(a) f.seek(0) # rewind f.write(b) f.close() </F> -- http://mail.python.org/mailman/listinfo/python-list
