Agfdhyk

from tkinter import *

from tkinter import messagebox



class after_sign_in(object):

    def __init__(self):

        self.sign_in_after()

    def sign_in_after(self):

        self.sign_in=Tk()

        self.sign_in.geometry('700x300')

        self.sign_in.maxsize(height=300,width=700)

        self.sign_in.title('Account')

        def sign_out():

            messagebox.showinfo('Have A Nice Day','You Are Signed Out')

            self.sign_in.destroy()

        sign_out=Button(self.sign_in,anchor='ne',text='Sign Out',command=sign_out)

        sign_out.pack(side='right')

        sign_out.place(x=620,y=5)

        fh=open('fh.txt','r+')

        _row=0

        ct =1

        for i in range(len(fh.readlines())):

            Label(self.sign_in, text=fh.readlines[i], width=22, anchor='center',padx=5,pady=5 ).grid(row=i,column=1)

            Label(self.sign_in, text=str(ct), width=22, anchor='center',padx=5,pady=5 ).grid(row=i+1)



t=after_sign_in()

The problem is here:

text=fh.readlines[i]

fh.readlines is a function that you would need to call first — ideally only once. Iterating over range(len(...)) is almost always useless and can be done easier.

I suggest iterating over the file handle directly (as you don't really need the list of lines. Since you still need the index i, you can use enumerate:

for i, line in enumerate(fh):

    Label(self.sign_in, text=line, width=22, anchor='center',padx=5,pady=5 ).grid(row=i,column=1)

    Label(self.sign_in, text=str(ct), width=22, anchor='center',padx=5,pady=5 ).grid(row=i+1)