Python 2.7 如何在两个函数之间删除全局变量

我目前的问题是，我试图使保存条目工作，但无法，因为这些条目是在另一个函数中定义的。如果我试着把它们从函数中去掉，它会说子页面没有定义，子页面不能从函数中移出。据我所知，子页面仍然在做它的工作，所以我研究了声明全局变量，但我发现的一切都是这样的例子

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()

变量位于函数外部，然后在具有全局范围的函数中使用它

除第二次tk开放外，该问题已得到解决

myGlobal = 5
def func1():
    myGlobal = 42

def func2():
    print myGlobal

func1()
func2()

---

检查

在这两个函数的定义之前声明如何？如果我没有遗漏什么，则此代码中没有条目，您说您的问题在于条目，因此请创建。此外，当尝试从条目中获取值时，您应该调用get方法。ln0=entry0.get，在seniles\u label2行中有一个奇怪的save\u page=Frameroot。你试过使用全局语句吗？对不起，代码很奇怪，我使用了ctrl-k并粘贴了代码，我看到了很多问题，并将其删除或放回原位。我刚刚实现并重新尝试了它，但效果略有不同，但正在创建一个额外的传统知识实例

    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