Displaying properties

As i’m trying, for one more time, to get familiar with scripting i started writing an addon that, if you had a video file selected in the sequencer, it would tell you the file’s framerate and set it in the properties.
The core of the script works, but i don’t know how to display it to the user. This is the code that i have so far:

import bpy
import subprocess, re

class GetFps(bpy.types.Operator):
    bl_idname = "sequencer.getfps"
    bl_label = "get fps"
    fps = bpy.props.FloatProperty(name = "some name")

    def get_fps(self, filepath):
        filepath = bpy.path.abspath(filepath)
        #filepath = filepath.replace(' ', '\ ')
        movieFile = r"" + filepath
        movieFile = (re.escape(movieFile))
        output = subprocess.check_output("exiftool " + movieFile, shell=True)

        string = b"Video Frame Rate"

        if string in output:
            z = output.index(string)
            x = output[z:]
            y = output.index(b"
            y = x[:y]
            y = re.findall(b"\d[0-9].[0-9]", y)
            y = float(y[0])
            return y
    def execute(self, context):
        file = context.selected_sequences[0]
        if file.type == 'MOVIE':
            filepath = file.filepath
            self.fps = self.get_fps(filepath)
        return {'FINISHED'}

EDIT: After i posted the question i realized that i could just do the calculations in a menu class and call the operator for submiting them. I don’t really know how to do that, but i think that this thread is now irrelavent

Right after i submited this post i realized that i don’t really need an operator for that, i could just make the calculations in a menu class and then call an operator to submit the changes. So the question becomes, how do i pass properties in an operator?