[英]global variable within a function
我試圖告訴一個函數使用place.forget()從屏幕上刪除按鈕lb,但是由於出現了錯誤,因為我已將按鈕lb定義為另一個函數中的全局變量,因此每次嘗試調用它時它沒有“看到”全局變量。 我知道為什么它會給我錯誤,但我不確定如何糾正它,任何幫助將不勝感激。
def page4():
master.title('Page 4')
#draw
c19.grid(pady=slpady)
c19.grid(row=sly,column=slx1)
c20.grid(row=sly,column=slx2)
c21.grid(row=sly,column=slx3)
c22.grid(row=sly,column=slx4)
c23.grid(row=sly,column=slx5)
c24.grid(row=sly,column=slx6)
rec.grid(row=rec_y, column=rec_x,columnspan=3)
clear_4.grid(row=clear_y, column=clear_x,columnspan=3)
#hide
c1.grid_remove()
c2.grid_remove()
c3.grid_remove()
c4.grid_remove()
c5.grid_remove()
c6.grid_remove()
c7.grid_remove()
c8.grid_remove()
c9.grid_remove()
c10.grid_remove()
c11.grid_remove()
c12.grid_remove()
c13.grid_remove()
c14.grid_remove()
c15.grid_remove()
c16.grid_remove()
c17.grid_remove()
c18.grid_remove()
new_show.grid_remove()
save_show.grid_remove()
load_show.grid_remove()
pre_1.grid_remove()
pre_2.grid_remove()
pre_3.grid_remove()
pre_4.grid_remove()
clear_1.grid_remove()
clear_2.grid_remove()
clear_3.grid_remove()
lb.place_forget()
#Presets
def presets():
master.title('Presets')
pre_1.grid(row=1,column=1,padx=ppadx, pady=ppady)
pre_2.grid(row=1,column=2,padx=ppadx, pady=ppady)
pre_3.grid(row=2,column=1,padx=ppadx, pady=ppady)
pre_4.grid(row=2,column=2,padx=ppadx, pady=ppady)
global lb
lb=Button(master,width=20,height=5,text='LOCK',bg='burlywood1',command=lockscreen)
lb.place(x=450,y=580)
我得到的錯誤是:
Exception in Tkinter callback Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1470, in __call__
return self.func(*args)
File "C:\Users\Josh Bailey\Desktop\pi_dmx\pi_dmx512py2.py", line 412, in page4
lb.place_forget() NameError: global name 'lb' is not defined
在啟動任何功能之前,請初始化lb。
我已經通過將全局lb和lb = Button(master,width = 20,height = 5,text ='LOCK',bg ='burlywood1',command = lockscreen)移到我的代碼的頂部來解決了它沒有任何功能,然后必須重新排列我的代碼的其余部分,以使該按鈕(鎖屏)所調用的功能位於預設功能的上方。 謝謝您的幫助!
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