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TypeError: argument must be string without null bytes, not str

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module Chat {
	interface ChatServer {
		long sign_on(in string name);
		void sign_off(in long clientid);
		string get_new_messages(in long clientid);
		void write_message(in long clientid, in string message);
		string get_userlist(in string separator);
		void send_file(in long clientid, in string file);
		string get_file(in string username);
	};
};

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def getbinaryfileasstring(name):
	inp = open(name, "rb")
	dateistring = ""
	for line in inp:
		dateistring += line
	return dateistring

o.send_file(myid, getbinaryfileasstring("test.png"))

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def send_file(self, clientid, stringfile):
	tempuser = get_user_from_list(clientid)
	filename = self.filepath + tempuser.get_clientid() + ".png"
	outp = open(filename, "wb")
	outp.write(stringfile)
	outp.close()