如何使用Tkinter从一个函数的值返回另一个函数？

Question

This is my problem. I can not return the value of the randomtext() function to the main function.

I want the text to be selected to be copied and then pasted somewhere. Using a Label works, but when I use an Entry it does not work. What am I doing wrong?

def psw_generator():
    global gen
    genpassw = Tk()
    genpassw.title("password generator")

    entrypassw = Entry(parent, textvariable = gen, state = DISABLED)
    entrypassw.pack()


def randomtext():

    x = 0
    psw = ""
    lenght = 16
    full_char_table = "abcdef.."
    type = full_char_table

    gen = StringVar(value = psw)

    for x in range(int(lenght)):
        psw += type[int(random.randrange(len(type)))]
        x += 1

    return gen

Answer 1

There are many problems in this code so I had solved them and your finished code is here:

import random
from tkinter import *

global gen
genpassw = Tk()
gen = StringVar()
genpassw.title("password generator")

entrypassw = Entry(genpassw, textvariable = gen, state = DISABLED)
entrypassw.pack()
def randomtext():
    global gen
    x = 0
    psw = ""
    length = 16
    full_char_table = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"


    for x in range(int(length)):
        psw += full_char_table[random.randint(0,len(full_char_table)-1)]

    gen.set(psw)

randomtext()
genpassw.mainloop()

So have a look at your problems

entrypassw = Entry(parent, textvariable = gen, state = DISABLED)

What is 'parent' in the entry widget you need to use genpassw because that is your parent widget.

type = full_char_table

You had used 'type' as a variable, 'type' is builtin function of python so you cannot use it.

x += 1

No need to use increment in for loop>> x += 1

entrypassw = Entry(parent, textvariable = gen, state = DISABLED)
entrypassw.pack()

return gen

You are returning gen.Before you described them as text variable for widget, and now you are returning it. It is deprecated.

You must use mainloop to make your GUI run.

genpassw.mainloop()