root=Tk（），有其他选择吗？

Question

是否有人知道以下方面的替代方案： 根=tk（）

当我运行我的程序，多个窗口同时运行，只是想知道是否有一个替代方案，使它们不会同时打开。当按下初始窗口上的按钮时，应启动程序运行后立即打开的第二个窗口。我还尝试使用： 根=顶层（） 但结果是一样的。 有什么想法吗？谢谢

def Search_Inventory():
#---First Window----
root = Toplevel()
root.title("Warehouse Inventory Control System")
root.configure(bg = "black")

#----Title displayed under the company logo on the first window----
Title_Screen = Label(root,
                     text="Warehouse Inventory Control System",
                     fg="grey",
                     bg="black",
                     font="Helevetica 25 bold",
                     pady = "50",
                     padx = "50",
                     ).grid(row=3, column=4)

#----Interactive Input Boxes for the User----

#----Label to Notify what is needed in the entry box----

PN_Info_Label = Label(root,
                    text = "Part Number:",
                    fg="white",
                    bg="black",
                    font="Helevetica 15 bold",
                    padx = 50,
                    ).grid(row=14, column=3, rowspan = 2)

#----Input Box for Part Number

PN_Display = StringVar()
Input_PartNumber = Entry(root,
                         textvariable=PN_Display,
                         fg = "blue",
                         font = "Helevtica 25 bold",
                         ).grid(row=14, column=4)

#----A button that will proceed to the next part of the program----

Search_Button = Button(root,
                       text = "Search Inventory",
                       fg = "Blue",
                       bg = "Grey",
                       bd = 2,
                       font="Helevetica 15 bold",
                       command=lambda:Search_Prod(PN_Display.get()),
                       height = 1,
                       width = 15,
                       ).grid(row=16, column=4,pady = 25,padx = 25,)

#----Information regarding how to enter the part number---
Info = Label(root,
             text="Please Use Capitals to Enter Part Number",
             fg= "red",
             bg = "black",
             font = "helevetica 12 bold",
             ).grid(row = 15, column = 4)
#----Adding the company logo to the first window----

photo = PhotoImage(file="image.gif")
photoLabel = Label(image=photo)
photoLabel.image = photo
photoLabel.grid(row=1, column=4, pady = 10)

#----Linking the Help Document----

Help_Button = Button(root,
                     text = "Help",
                     command=Help_PDF,
                     fg = "Red",
                     bg = "Black",
                     height = "1",
                     bd = "2",
                     font = "Helevetica 20 bold",
                     width = "4",
                     ).grid(row=0, column=5, pady= 10,padx = 50, sticky = E)

#----Saying who the program was made by----

Credits = Label(root,
                text = "Created By: Me",
                fg = "White",
                bg = "Black",
                font = "Helevetica 10 underline",
                ).grid(row = 19, column = 5)
#To Make Sure that the window doesn't close
root.mainloop()

这是一个子程序，它本打算稍后运行，但却直接运行。在

^{pr2}$

这是最初要弹出的内容，但与另一个完全混淆。在

Answer 1

command=需要函数名-callback-表示没有()

但你有()在里面

  command = Search_Inventory()

这就是为什么这是在开始时执行的，而不是当你点击按钮时

---

顺便说一句：tkinter只需要一个mainloop()-如果你使用两个mainloop()，那么它就不能正常工作了。在

---

编辑：图像的问题是因为您没有在第二个窗口中为Label设置父项

^{pr2}$

所以它默认使用主窗口

你需要

photoLabel = Label(root, image=photo)

---

编辑：最小工作代码

from tkinter import *

def Help_PDF():
    pass

def Search_Inventory():

    # - Second Window   
    root = Toplevel()

    Title_Screen = Label(root, text="Warehouse Inventory Control System")
    Title_Screen.grid(row=3, column=4)

    PN_Info_Label = Label(root, text="Part Number:")
    PN_Info_Label.grid(row=14, column=3, rowspan=2)

    PN_Display = StringVar()

    Input_PartNumber = Entry(root, textvariable=PN_Display)
    Input_PartNumber.grid(row=14, column=4)

    Search_Button = Button(root, text="Search Inventory",
                           command=lambda:Search_Prod(PN_Display.get()))
    Search_Button.grid(row=16, column=4, pady=25, padx=25)

    Info = Label(root, text="Please Use Capitals to Enter Part Number")
    Info.grid(row=15, column=4)

    photo = PhotoImage(file="image.gif")

    photoLabel = Label(root, image=photo)
    photoLabel.image = photo
    photoLabel.grid(row=1, column=4, pady=10)

    Help_Button = Button(root, text="Help",
                         command=Help_PDF)
    Help_Button.grid(row=0, column=5, pady=10, padx=50, sticky=E)

    Credits = Label(root, text="Created By: Me")
    Credits.grid(row=19, column=5)


#  - First Window  -

root_menu = Tk()

photo = PhotoImage(file="logo.gif")
photoLabel = Label(root_menu, image=photo)
photoLabel.image = photo
photoLabel.grid(row=1, column=3, columnspan=4, sticky=N)

Title_Screen = Label(root_menu, text="Welcome to the SsangYong\n Warehouse Inventory                                      Control System",)
Title_Screen.grid(row=2, column=3)

Search_Inventory = Button(root_menu, text="Search Inventory",
                      command=Search_Inventory)
Search_Inventory.grid(row=16, column=3, pady=25, padx=25)

Add_Stock = Button(root_menu, text="Add New Items")
Add_Stock.grid(row=15, column=3, pady=25, padx=25)

Print_Report =  Button(root_menu, text="Print Stock Report")
Print_Report.grid(row=17, column=3, pady=25, padx=25)

Help_Button = Button(root_menu, text="Help",
                 command=Help_PDF)
Help_Button.grid(row=1, column=3, rowspan=2, sticky=NE)

Credits = Label(root_menu, text="Created By:mk")
Credits.grid(row=19, column=5)

root_menu.mainloop()

Answer 2

does anyone know any alternatives for: root = tk() [sic]

别无选择。tkinter应用程序绝对必须有一个根窗口。如果您没有显式地创建一个（您应该这样做），那么在您第一次创建任何其他小部件时，将为您创建一个。在

The second window that opens as soon as the program is run should be launched when a button on the initial window is pressed.

这样做的原因是你让它马上打开。看看这个代码：

Search_Inventory = Button(root_menu,
                  command = Search_Inventory(),

上述代码与此相同：

^{pr2}$

请注意，命令中缺少()。command属性需要对函数的引用。在