如何刪除兩個功能之間的全局變量

Question

from Tkinter import * 
import random 
entry_values = [] 
population_values = [] 

subpage = 0 

entry0 = Entry(subpage) 
entry1 = Entry(subpage) 
entry2 = Entry(subpage) 
entry3 = Entry(subpage) 
entry4 = Entry(subpage) 
entry5 = Entry(subpage) 
entry6 = Entry(subpage) 
entry7 = Entry(subpage) 


def main_menu(root): 
    menu = Frame(root) 
    button0 = Button(menu, text="Set Generation Zero Values", 
       command=lambda: switch_page("sub")) 
    button0.grid(row=0, column=0, sticky=W) 

    button1 = Button(menu, text="Display Generation Zero Values", 
       command = lambda: switch_page("sub2")) 
    button1.grid(row=1, column=0, sticky=W) 

    button2 = Button(menu, text="Run Model", 
       command = lambda: switch_page("sub3")) 
    button2.grid(row=2, column=0, sticky=W) 

    button3 = Button(menu, text="Export Data") 
    button3.grid(row=3, column=0, sticky=W) 

    button4 = Button(menu, text="Exit Program", command=menu.destroy) 
    button4.grid(row=4, column=0, sticky=W) 

    return menu 

def sub_menu(root): 
    global subpage 
    subpage = Frame(root) 
    button5 = Button(subpage, text="Save Generation Data", 
       command = lambda: save_entries()) 
    button5.grid(row=1, column= 6, sticky=E) 

    button6 = Button(subpage, text="Return To Main Page", 
       command = lambda: switch_page("main")) 
    button6.grid(row=0, column= 6, sticky=W) 

    juveniles_label0 = Label(subpage,text="Juveniles") 
    adults_label1 = Label(subpage,text="Adults") 
    seniles_label2 = Label(subpage,text="Seniles") 
    population_label3 = Label(subpage,text="Population (Thousands)") 
    survival_rate_label4 = Label(subpage,text="Survival Rate (Between 0 and 1)") 
    birth_rate_label5 = Label(subpage,text="Birth Rate") 
    number_of_gens_label6 = Label(subpage,text="Number of Generations") 

    global entry0 
    entry0 = Entry(subpage) 
    global entry1 
    entry1 = Entry(subpage) 
    global entry2 
    entry2 = Entry(subpage) 
    global entry3 
    entry3 = Entry(subpage) 
    global entry4 
    entry4 = Entry(subpage) 
    global entry5 
    entry5 = Entry(subpage) 
    global entry6 
    entry6 = Entry(subpage) 
    global entry7 
    entry7 = Entry(subpage) 


    juveniles_label0.grid(row=0, column=1) 
    adults_label1.grid(row=0, column=2) 
    seniles_label2.grid(row=0, column=3) 
    population_label3.grid(row=1, column=0) 
    survival_rate_label4.grid(row=2, column=0) 
    birth_rate_label5.grid(row=3, column=0) 
    number_of_gens_label6.grid(row=3, column=2) 

    entry0.grid(row=1, column=1) 
    entry1.grid(row=1, column=2) 
    entry2.grid(row=1, column=3) 
    entry3.grid(row=2, column=1) 
    entry4.grid(row=2, column=2) 
    entry5.grid(row=2, column=3) 
    entry6.grid(row=3, column=2) 
    entry7.grid(row=3, column=3) 



    return subpage 
def display_values(root): 
    sub2 = Frame(root) 
    label0 = Label(sub2, text = "") 
    label1 = Label(sub2, text="") 

    button7 = Button(sub2, text="Return To Main Page", 
       command = lambda: switch_page("main")) 

    label0.grid(row=1, column=1) 
    label1.grid(row=2, column=2) 

    button7.grid(row=1, column=10) 

    return sub2 

def run_model(root): 
    sub3 = Frame(root) 
""" 
newjuveniles = entry_values[1] * entry_values[6] #new juveniles = adults * birthrate 
newseniles = (entry_values[2]*entry_values[5]) + (entry_values[1] * entry_values[4]) #new seniles = adults + survivingseniles 
newadults= entry_values[0] * entry_values[3]#juveniles to adults juveniles * juvenile survibal rate 
""" 
    button8 = Button(sub3, text="Return To Main Page", 
       command = lambda: switch_page("main")) 

    button8.grid(row=1, column=10) 
    return sub3 

def save_entries(): 
    save_page = Frame(root) 
    ln0 = entry0.get 
    entry_values.append(ln0) 
    print entry_values 

    return save_page 


def switch_page(page_name): 
    slaves = root.pack_slaves() 
    if slaves: 

     slaves[0].pack_forget() 
    pages[page_name].pack(fill="both", expand=True) 

root = Tk() 
pages = { 
    "main": main_menu(root), 
    "sub": sub_menu(root), 
    "sub2":display_values(root), 
    "sub3":run_model(root), 

} 

switch_page("main") 
root.mainloop() 

我現在的問題是，我試圖使保存條目工作，不能因爲條目在另一個函數中定義。如果我試圖將它們從函數中取出，那麼它會說子頁面沒有被定義，並且子頁面不能被移出函數（據我所知）並且仍然做它的工作，所以我研究了聲明全局變量，但是我找到的所有東西都是一個例子像這樣

myGlobal = 5 
def func1(): 
    myGlobal = 42 

def func2(): 
    print myGlobal 

func1() 
func2() 

其中變量在函數之外，然後他們在具有全局作用域的函數中使用它。

的問題，除了解決傳統知識開放

Answer 1

myvariable = 5 
def func(): 
    global myvariable 
    myvariable = 6 #changes `myvariable` at the global scope 
    print myvariable #prints 6 

func() 
print myvariable #prints 6 now because we were able 
        #to modify the reference in the function 

檢查this