bonjour
voici mon code j'ai pas d'erreur, mais si j'appuis sur la touche graphe rien ne se passe.

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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import matplotlib as plt
import matplotlib
matplotlib.use('TkAgg')
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk 
from matplotlib.figure import Figure
from tkinter import *
from tkinter import filedialog
import tkinter as tk
import pandas as pd
global nucl , percent,symb
import io
from keras.models import load_model
from keras.preprocessing import image
import numpy as np
 
class mclass:
    global color
    color="white"
 
    def __init__(self,  root):
        self.logo = PhotoImage(file="/Users/imed/Desktop/interface/rium.png")
        self.root = root
        #helv36 = tkFont.Font(family='Helvetica', size=14, weight='bold')
        self.nucl= StringVar()
        self.percent=StringVar()
        self.symb=StringVar()
        self.symb.set("%")
        self.root.wm_title("Isotope Tdentification")
 
        self.frame = tk.Frame(master=self.root)
        self.frame.pack(fill=tk.BOTH, expand=1)
 
        self.figure = Figure(figsize=(5, 4), dpi=100)
        self.axes = self.figure.add_subplot(111)
        self.canvas = FigureCanvasTkAgg(self.figure, master=self.frame)
        self.canvas.draw()
        self.canvas.get_tk_widget().place(x=10, y =40, width=450, height=400)
 
        self.label = tk.Label(master=self.frame,textvariable=self.nucl,bg="red")
        self.label.place(x=50, y=10)
 
        # Utilisation d'une fermeture, les valeurs de canvas et figure sont capturées 
        self.button = tk.Button(master=self.frame, text='Verifier', command=self.learn)
        self.button.pack(side=tk.BOTTOM)
        self.button = tk.Button(master=self.frame, text='Graphe', command=self.plot)
        self.button.pack(side=tk.BOTTOM)
        self.button = tk.Button(master=self.frame, text='Parcourir', command=self.askopenfile)
        self.button.pack(side=tk.BOTTOM)
        self.toolbar = NavigationToolbar2Tk(self.canvas,self.frame )
        #toolbar.config(background=color)
        self.toolbar.update()
        self.toolbar.pack(side=tk.BOTTOM)
    def askopenfile(self):
         self.fil=filedialog.askopenfilename(initialdir = "/",title = "Select file",filetypes = (("xlsx files","*.xlsx"),("all files","*.*")))
    def plot (self):  
        self.xl = pd.ExcelFile(self.fil)
        self.df1 = self.xl.parse('Spectre')
        self.coups=self.df1['Coups']
        self.energie=self.df1['Energie (keV)']
        self.fig = Figure(figsize=(5,4), dpi=100)
 
        self.figure.canvas.draw()
        if self.fig.axes:
            self.figure.delaxes(figure.axes[0])
        #axes = figure.add_subplot(111)
        self.a = self.fig.add_subplot(111)
        self.a.set_facecolor(color)
        self.a.plot(self.energie,self.coups,'k')
        self.a.vlines(x=self.energie,ymin=0,ymax=self.coups,color='black')
 
        self.imag = io.BytesIO()
        self.figure.savefig(self.imag, format='png')
        self.imag.seek(0)
        #return self.imag
    def learn(self): 
 
        model = load_model('/Users/imed/Desktop/new_model_200.h5')
        self.nucleide=['Mn','U','Cs','Am','Na','Co60','Y','Sr']
 
        self.img = image.load_img(self.imag, target_size=(128, 128))
 
        self.x = image.img_to_array(self.img)
        self.x = np.expand_dims(self.x, axis=0)
 
        self.images = np.vstack([self.x])
        self.classes = model.predict_classes(self.images/255)
        print(self.nucleide[self.classes[0]]) 
        self.nucl.set(self.nucleide[self.classes[0]])
 
root= Tk()
root.geometry("623x552")
root.title()
#window.configure(background=color)
start= mclass (root)
root.mainloop()