How do I locate the class name, object attribute and variables, and object methods

import sys
import numpy as np


frankston_stock = []
sunbury_stock = []
werribee_stock = []


def main():
all_vehicles = read_from_file()

frankston_stock.extend(all_vehicles[0])
sunbury_stock.extend(all_vehicles[1])
werribee_stock.extend(all_vehicles[2])

view_menu()

def view_menu():
""""""
menu = "\n"+43*"-"
menu += "\nToyota Car Stock Software \n"
menu +="\n"+43*"-"
menu += "\na. Add a vehicle\n"
menu += "b. Display dealers stock\n"
menu += "c. Remove a vehicle\n"
menu += "d. Save to file\n"
menu += "e. Exit\n"
menu += "Choose Your Choice:\n"
sys.stdout.write(menu)

#
menu_choice = sys.stdin.readline().strip().lower()
if menu_choice == "a":
    add_a_vehicle()
elif menu_choice == "b":
    display_dealer_stock()
elif menu_choice == "c":
    remove_a_vehicle()
elif menu_choice == "d":
    save_to_file()

def get_all_dealer_cars():


all_dealer_cars = []

all_dealer_stock = read_from_file()

for car in all_dealer_stock:
    car.pop(0)
    all_dealer_cars.extend(car)


all_dealer_cars = np.unique(all_dealer_cars).tolist()

for car in all_dealer_cars:
    sys.stdout.write("\n".ljust(20) + car)
return


def read_from_file():

all_vehicles = []
with open("inventory.txt", "r") as dealer_car_stock:
    for line in dealer_car_stock:
        line = line.strip()
        line = line.split(",")
        if line[0] == "Frankston" or line[0] == "Sunbury" or line[0] == "Werribee":
            all_vehicles.append(line)

        else:
            sys.stdout.write("File is empty or corrupted")

return all_vehicles


def display_dealer_stock():



frankston_cars = []
sunbury_cars = []
werribee_cars = []

toyota_location = ["All Dealers", "Werribee", "Sunbury", "Frankston\n"]

for i in range(0, len(toyota_location)):

    
    sys.stdout.write("\n"+30*"="+"\n")
    sys.stdout.write("\nToyota Dealership".ljust(20) + toyota_location[i])
    sys.stdout.write("\nCurrently In Stock")
    
    if toyota_location[i] == "Frankston":

        frankston_cars.extend(frankston_stock)

        frankston_cars.pop(0)

        print_vehicles(np.unique(frankston_cars).tolist())
    elif toyota_location[i] == "Sunbury":
        sunbury_cars.extend(sunbury_stock)

        sunbury_cars.pop(0)

        print_vehicles(np.unique(sunbury_stock).tolist())
    elif toyota_location[i] == "Werribee":
        werribee_cars.extend(werribee_stock)

        werribee_cars.pop(0)

        print_vehicles(np.unique(werribee_cars).tolist())
    else:
        get_all_dealer_cars()

view_menu()


def add_a_vehicle():
""""""
sys.stdout.write("Please select following dealer locations: \n1.Frankston \n2.Sunbury\n3.Werribee\n")

while dealer_location != "":
    if dealer_location == "1":
        sys.stdout.write("Please enter vehicle to be added to Frankston stock: \n")
        add_vehicle = sys.stdin.readline().strip()

        frankston_stock.append(add_vehicle)

        sys.stdout.write("Car has been added\n")
        view_menu()
        break
    elif dealer_location == "2":
        sys.stdout.write("Please enter vehicle to be added to Sunbury stock: \n")
        add_vehicle = sys.stdin.readline().strip()
        sunbury_stock.append(add_vehicle)
        sys.stdout.write("Car has been added\n")
        view_menu()
        break
    elif dealer_location == "3":
        sys.stdout.write("Please enter vehicle to be added to Werribee stock: \n")
        add_vehicle = sys.stdin.readline().strip()
        werribee_stock.append(add_vehicle)
        #The append() method appends car to the end of the list.
        sys.stdout.write("Car has been added\n")
        view_menu()
        break
    else:
        sys.stdout.write("Please make sure you enter the correct location: \n")
        dealer_location = sys.stdin.readline().strip().lower()



def remove(location_stock):


vehicle_model = sys.stdin.readline().strip()
while True:

    if vehicle_model not in location_stock:
        sys.stdout.write("Car not in stock\n")
        vehicle_model = sys.stdin.readline().strip()
    else:
        break
location_stock.remove(vehicle_model)
view_menu()


def remove_a_vehicle():
""""""
sys.stdout.write("Please select following dealer locations: \n1.Frankston \n2.Sunbury\n3.Werribee\n")
dealer_location = sys.stdin.readline().strip().lower()
while dealer_location != "":
    if dealer_location == "1":
        sys.stdout.write("Please enter car that you want to remove from Frankston stock list: \n")
        remove(frankston_stock)
        break
    elif dealer_location == "2":
        sys.stdout.write("Please enter carthat you want to remove from Sunbury stock list: \n")
        remove(sunbury_stock)
        break
    elif dealer_location == "3":
        sys.stdout.write("Please enter carthat you want to remove from Werribee stock list: \n")
        remove(werribee_stock)
        break
    else:
        sys.stdout.write("Wrong selection, please select again \n")
        dealer_location = sys.stdin.readline().strip().lower()



def save_to_file():

inventory_file = open("inventory.txt", "w")
num_cars = len(frankston_stock)
for i in range(0, num_cars):
    if i == num_cars - 1:
        inventory_file.write(frankston_stock[i] + "\n")
    else:
        inventory_file.write(frankston_stock[i] + ",")

num_cars = len(sunbury_stock)

for i in range(0, num_cars):
    if i == num_cars - 1:
        inventory_file.write(sunbury_stock[i] + "\n")
    else:
        inventory_file.write(sunbury_stock[i] + ",")

num_cars = len(werribee_stock)

for i in range(0, num_cars):
    if i == num_cars - 1:
        inventory_file.write(werribee_stock[i] + "\n")
    else:
        inventory_file.write(werribee_stock[i] + ",")

inventory_file.close()
sys.stdout.write("Changes has been made, thanks\n")
view_menu()


def print_vehicles(vehicle_list):
for car in vehicle_list:
    sys.stdout.write("\n".ljust(20) + car)

class name, object attribute and variables, and object methods