Function not being recognised due to multiple frames in Tkinter application

Question

I am creating a Tkinter application which has multiple frames. When you click the add button it takes you to another frame. You then press the add assessment button which has the command display. In this command, it packs a progress bar and button, which has another command step, onto the HomePage. I have defined step above the display command, however when I run the program an error occurs saying step is not defined. I believe this is due to the multiple frames but I am not sure how to fix it.

import calendar
import tkinter as tk
from tkinter import ttk
from tkcalendar import *
from datetime import datetime
from datetime import date
from time import strftime
from datetime import timedelta, datetime, date

class StudyFriendO(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)

        self.title("StudyFriendO") #naming window title
        self.geometry('850x830') #size of window

        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand = True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        #### ADDED
        self.shared_data = {  # Variables shared by all pages.
            'name': tk.StringVar(value=''),
            'assessment': tk.StringVar(value=''),
            'due_date': tk.StringVar(value='')
          
        }

        self.frames = {}

        for F in (HomePage, AddPage): #list of multiple frames of program
            frame = F(container, self)
            self.frames[F] = frame
            frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame(HomePage)

    def show_frame(self, cont):
        frame = self.frames[cont]
        frame.tkraise()

    def step(frame2):
        my_progress['value']+= 5

    def display(self, cont):
        frame1: HomePage = self.frames[HomePage]
        frame1.my_progress = ttk.Progressbar(frame1, orient='horizontal', length=300, mode='determinate')
        frame1.my_progress.place(x=460, y=460, anchor='center')
        frame1.my_button = tk.Button(frame1, text="Progress", command=step)
        frame1.my_button.pack(pady=20)

class HomePage(tk.Frame):



    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        #label = tk.Label(self, text="Home", font = LARGE_FONT)
        #label.pack(pady=10,padx=10)

        add_button = ttk.Button(self, text="Add", command=lambda: controller.show_frame(AddPage))
        add_button.place(relx=0.8, rely=1, anchor='se')


class AddPage(tk.Frame):

        
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)


        add_button = ttk.Button(self, text="Add Assesment", command=lambda: controller.display(HomePage))
        add_button.place(relx=0.5, y=560, anchor='center')

app = StudyFriendO()
app.mainloop()