Update plot by <Return> bind with entry widget

[Zorro]

So I got it....
Check it out and let me know if you have some suggestions for improvement.

Cheers...

try:
    import Tkinter as tk
except ImportError:
    import tkinter as tk

try:
    import ttk
    py3 = False
except ImportError:
    import tkinter.ttk as ttk
    py3 = True

from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure
import numpy as np

def init(top, gui, *args, **kwargs):
    global w, top_level, root
    w = gui
    top_level = top
    root = top

def destroy_window():
    # Function which closes the window.
    global top_level
    top_level.destroy()
    top_level = None

class App:
    def __init__(self, master):
        
        global top_level
        top_level = root
        
        root.geometry("826x862+639+123")
        root.title("interactive plot")
        
        self.TLabel1 = ttk.Label(root)
        self.TLabel1.place(relx=0.024, rely=0.023, height=24, width=83)
        self.TLabel1.configure(relief='flat')
        self.TLabel1.configure(text='''Input value''')
        ##########################################################
        ## Frame 1 ###############################################
        self.Frame1 = tk.Frame(root)
        self.Frame1.place(relx=0.012, rely=0.058, relheight=0.102
                , relwidth=0.975)
        self.Frame1.configure(relief='groove')
        self.Frame1.configure(borderwidth="2")
        self.Frame1.configure(highlightcolor="black")
        self.Frame1.configure(width=805)
        
        self.Entry1_1 = tk.Entry(self.Frame1)
        self.Entry1_1.place(relx=0.025, rely=0.114,height=35, relwidth=0.124)
        self.Entry1_1.configure(highlightcolor="black")
        self.Entry1_1.configure(selectforeground="black")
        self.Entry1_1.insert(0,1)
        self.Entry1_1.bind("<Return>", self.updatePlot)
        ##########################################################
        ## Frame 2 ###############################################
        self.TLabel1_11 = ttk.Label(root)
        self.TLabel1_11.place(relx=0.024, rely=0.174, height=24, width=83)
        self.TLabel1_11.configure(relief='flat')
        self.TLabel1_11.configure(text='''Plot''')

        self.Frame2 = tk.Frame(root)
        self.Frame2.place(relx=0.012, rely=0.209, relheight=0.58, relwidth=0.969)
        self.Frame2.configure(relief='groove')
        self.Frame2.configure(borderwidth="2")
        self.Frame2.configure(relief='groove')
        self.Frame2.configure(highlightcolor="black")
        self.Frame2.configure(width=805)
        
        ##########################################################
        ## create plot with default values from Entry widget
        fig = Figure()
        self.subplot1 = fig.add_subplot(111)
        x = np.linspace(0,0.05,500)
        meanVal = float(self.Entry1_1.get())
        y = meanVal*np.sqrt(2)*np.sin(2*np.pi*50*x)
        self.line, = self.subplot1.plot(x,y)
        self.subplot1.grid(True)
        self.subplot1.autoscale(enable=True)
                
        self.canvas = FigureCanvasTkAgg(fig, master=self.Frame2)
        self.canvas.draw()
        self.canvas.get_tk_widget().pack(side='top', fill='both', expand=1)
        ##########################################################
        ## Buttons ###############################################
        
        self.TButton_close = ttk.Button(root)
        self.TButton_close.place(relx=0.86, rely=0.951, height=25, width=96)
        self.TButton_close.configure(command=destroy_window)
        self.TButton_close.configure(takefocus="")
        self.TButton_close.configure(text='''Close''')
        
    def updatePlot(self, *args):
        x, y = self.line.get_data()
        meanVal = float(self.Entry1_1.get())
        self.subplot1.cla()
        y = meanVal*np.sqrt(2)*np.sin(2*np.pi*50*x)**meanVal
        self.subplot1.plot(x,y)
        self.subplot1.grid(True)
        self.canvas.draw()
    
if __name__ == '__main__':
    root = tk.Tk()
    app = App(root)
    init(root, app)
    root.mainloop()