savestuff.py

def read_passwords(self,filename):
        if os.path.exists(filename):
            with open(filename) as file:
                return json.load(file)
        else:
            data = {}
            with open(filename,'w') as outfile:
                json.dump(data,outfile)
            return data
    
    def save_passwords(self,data,filename):
        with open(filename,'w') as file:
            json.dump(data,file)