如何在tkinter python中使用条目作为浮点变量？

Question

我正在尝试编写一个python tkinter程序，用于计算某个bpm下一定数量节拍的时间（以秒为单位）。无论如何，我很难使用tkinter作为浮点变量输入。我想要一些关于如何使我的代码工作的建议。我是一名初学程序员，所以我的代码有点不稳定，谢谢。这是我的代码......

window = Tk()
window.title( 'Bpm Timeslicer' )


intro = Label(window, text='Enter a Bpm and enter a number of beats,      and the program will calculate sample time in seconds')
bpmL = Label(window, text='BPM')
bpmIn = Entry(window)
beatsL = Label(window, text='Number of beats')
beatsIn = Entry(window)
timeOut = Label(window, text='Time:')



def run():

    bpm = bpmIn.get()
    beats = beatsIn.get()
    bpm = float(bpm)from tkinter import *

    beats = float(beats)
    time1 = float(0)
    min = 0
    perc = 0

    perc = beats / bpm
    time1 = min * perc 
    timeOut = Label(window, time1)

btn_run = Button( window, text = 'Run', command=run )
btn_end = Button( window , text = 'Close', command=exit )


intro.pack()
bpmL.pack()
bpmIn.pack()
beatsL.pack()
beatsIn.pack()
timeOut.pack()
btn_run.pack()
btn_end.pack()


window.mainloop()