AttributeError: 'str' object has no attribute '_root' in python3 on windows 10-CodePudding

My code:

from tkinter import *
from tkinter.ttk import Combobox
import random

screen = Tk()
screen.title("Password Generator")
screen.geometry('600x400')
screen.configure(background ="gray")

def Password_Gen():
    global sc1
    sc1.set("")
    passw=""
    length=int(c1.get())
    lowercase='abcdefghijklmnopqrstuvwxyz'
    uppercase='ABCDEFGHIJKLMNOPQRSTUVWXYZ' lowercase
    mixs='0123456789' lowercase uppercase '@#$%&*'

    if c2.get()=='Low Strength':
        for i in range(0,length):
            passw=passw random.choice(lowercase)
        sc1.set(passw)
    elif c2.get()=='Medium Strength':
            for i in range(0,length):
                passw=passw random.choice(uppercase)
            sc1.set(passw)
    elif c2.get()=='High Strength':
            for i in range(0,length):
                passw=passw random.choice(mixs)
            sc1.set(passw)

sc1=StringVar('')
t1=Label(screen,text='Password Generator',font=('Arial',25),fg='green',background ="gray")
t1.place(x=60,y=0)
t2=Label(screen,text='Password:',font=('Arial',14),background ="gray")
t2.place(x=145,y=90)

il=Entry(screen,font=('Arial',14),textvariable=sc1)
il.place(x=270,y=90)
t3=Label(screen,text='Length: ',font=('Arial',14),background ="gray")
t3.place(x=145,y=120)

t4=Label(screen,text='Strength:',font=('Arial',14),background ="gray")
t4.place(x=145,y=155)

c1=Entry(screen,font=('Arial',14),width=10)
c1.place(x=230,y=120)

c2=Combobox(screen,font=('Arial',14),width=15)
c2['values']=('Low Strength','Medium Strength','High Strength')
c2.current(1)
c2.place(x=237,y=155)

b=Button(screen,text='Generate!',font=('Arial',14),fg='green',background ="gray",command=gen)
b.place(x=230,y=195)

screen.mainloop()

For some reason I'm keep getting those errors:

Traceback (most recent call last):
  File "C:\Users\z\3D Objects\birthday\passwordgeneratorgui.py", line 32, in <module>
    sc1=StringVar('')
  File "C:\Users\z\AppData\Local\Programs\Python\Python310\lib\tkinter\__init__.py", line 540, in __init__
    Variable.__init__(self, master, value, name)
  File "C:\Users\z\AppData\Local\Programs\Python\Python310\lib\tkinter\__init__.py", line 372, in __init__
    self._root = master._root()
AttributeError: 'str' object has no attribute '_root'

How can I fix those errors?

CodePudding user response：

This is because the first argument to StringVar should be the "container". You are passing in an empty string instead of that. Replace the line sc1=StringVar('') with sc1=StringVar(). You can also read a guide to StringVars like this one: https://www.pythontutorial.net/tkinter/tkinter-stringvar/

Another mistake in your code is in this line:

b=Button(screen,text='Generate!',font=('Arial',14),fg='green',background ="gray",command=gen)

The problem is that you are passing in a function gen, which doesn't exist. I guess that you want to call the function Password_Gen with this button. So, replace it with this line:

b=Button(screen,text='Generate!',font=('Arial',14),fg='green',background ="gray",command=Password_Gen)

EDIT:

I have also noticed a minor problem with your password generator.

lowercase='abcdefghijklmnopqrstuvwxyz'
uppercase='ABCDEFGHIJKLMNOPQRSTUVWXYZ' lowercase
mixs='0123456789' lowercase uppercase '@#$%&*'

In the mixs variable, there will be lowercase letters twice, I don't think you want this. I think what you want is this (because lowercase letters are already included in your uppercase variable):

mixs='0123456789' uppercase '@#$%&*'