How to call a function after displayed frame?

Question

I want to do speech recognition in my code. There is multiple frame i used in this code. The start page actually only the menu for start the application. There is a button to start the app in the startPage. After that the PageOne will appear. But i want to do speech recognition in the page one. If i call the speechh function, the speech recognition will start right after i run the code. I want to ask what should i do to make the speech recognition will start in the page One after i clicked the button in the startPage?

import tkinter as tk   # python3
#import Tkinter as tk   # python
from PIL import ImageTk, Image
import speech_recognition as sr
import threading, time
import sys


TITLE_FONT = ("Helvetica", 18, "bold")
str=""
arr=["E", "F P", "T O Z", "L P E D", "P E C F D", "E D F C Z P", "F E L O P Z D", "D E F P O T E C", "L E F O D P C T", "F D P L T C E O", "P E Z O L C F T D"]
page=["PageOne", "PageTwo"]

def speechh():
    # while True:
    r = sr.Recognizer()
    with sr.Microphone() as source:
        print("Say something!")
        audio = r.listen(source)

    # Speech recognition using Google Speech Recognition
    try:
        # for testing purposes, we're just using the default API key
        # to use another API key, use r.recognize_google(audio, key="GOOGLE_SPEECH_RECOGNITION_API_KEY")
        # instead of r.recognize_google(audio)
        str = r.recognize_google(audio)
        print(str)
        print("You said: " + str)
    except sr.UnknownValueError:
        print("Google Speech Recognition could not understand audio")
    except sr.RequestError as e:
        print("Could not request results from Google Speech Recognition service; {0}".format(e))

    asd = ""

class SampleApp(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        # self.attributes("-fullscreen", True)
        # the container is where we'll stack a bunch of frames
        # on top of each other, then the one we want visible
        # will be raised above the others
        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}
        # sys.stdin.read(1)
        for F,geometry in zip((StartPage, PageOne, PageTwo), ('1940x800', '1940x800', '1940x800')):
            # sys.stdin.read(1)
            page_name = F.__name__
            frame = F(parent=container, controller=self)
            # store the frame and the geometry for this frame
            self.frames[page_name] = (frame, geometry)

            # put all of the pages in the same location;
            # the one on the top of the stacking order
            # will be the one that is visible.
            frame.grid(row=0, column=0, sticky="nsew")
        self.show_frame("StartPage")
    def show_frame(self, page_name):
        '''Show a frame for the given page name'''
        frame, geometry = self.frames[page_name]
        # change geometry of the window
        self.update_idletasks()
        self.geometry(geometry)
        frame.tkraise()
    def on_start(self):
        # for x in page:
        # self.show_frame("PageOne")
        # self.after_idle(speechh)
        for x in page:
            self.show_frame(x)
            speechh()
        # time.sleep(10)
        # speechh()
        # sys.stdin.read(1)
        # self.show_frame("PageTwo")
        # self.after_idle(speechh)


class StartPage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        fname = "coba2.gif"
        cv = tk.Canvas(self, bg="pink")
        cv.pack(side='top', fill='both', expand='yes')
        img = ImageTk.PhotoImage(file = "C:\\Users\\Shintia Tamara\\PycharmProjects\\ProjectAI\\coba2.gif")
        cv.create_image(10, 10, image = img, anchor = "nw")
        btn1 = tk.Button(cv, text="QUIT", height=2, width=20, bg="#686DCE", borderwidth=0,
                      fg="white", font=('Sans', '10', 'bold'))
        btn1.pack(side='right', padx=50, pady=50, anchor='se')
        btn2 = tk.Button(cv, text="START", height=2,command=controller.on_start, width=20, bg="#686DCE", borderwidth=0, fg="white",
                      font=('Sans', '10', 'bold'))
        btn2.pack(side='right', padx=5, pady=50, anchor='se')


class PageOne(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        letter = tk.Label(self, text=arr[0], font=("Helvetica", 432))
        letter.pack(side="bottom", expand="YES")


class PageTwo(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        letter = tk.Label(self, text="F P", font=("Helvetica", 216))
        letter.pack(side="bottom", expand="YES")

if __name__ == "__main__":
    app = SampleApp()
    app.mainloop()

Answer 1

Remove call to speech at the end, change command=lambda: controller.show_frame("PageOne"), to command=controller.on_start, and add this method near the show_frame method:

def on_start(self):
    self.show_frame("PageOne")
    speech()