CODEWITHSUNDEEP
tkinterpython-3.4
Oli Harding
Oli Harding

Reputation: 1

integer argument expected error tkinter python 3.4

I'm currently trying to help a friend out with the same task that i have previously done, but im stuck. once the program is run and 'get tickets' is pressed this error message is displayed:

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "C:\Python34\lib\tkinter__init__.py", line 1533, in call return self.func(*args) File "C:\Users\harding\Documents\Oli\Homework\Year10\Computing\New folder\carpark 3.4 (1).py", line 21, in reg_output b.readlines(v.get()) TypeError: integer argument expected, got 'str'

code:

    from tkinter import *
    import time

    root = Tk()
    root.title('Car Park')

    v = StringVar()

   car_in=Label(root, text= "Please enter your reg number")
   car_in.grid(column=1, row=1)

   reg_input=Entry(root, textvariable =v)
   reg_input.grid(column=1, row=2)

   def reg_input():
     with open ('tickets.txt', 'w') as b:
        b.writelines(v.get())

   def reg_output():
     with open ('tickets.txt', 'r') as b:
        b.readlines(v.get())

   reg_input_but=Button(root, text='Submit', command=reg_input)
   reg_input_but.grid(column=1, row=4)

   reg_output_b=Button(root, text='Get Ticket', command=reg_output)
   reg_output_b.grid(column=1, row=5)

Upvotes: 0

Views: 124

Answers (2)

Nikhil H
Nikhil H

Reputation: 113

Looking at the error, function readlines expects integer arguments and v.get() returns a string, causing the error. What you can do is simply change b.readlines(v.get()) on line 21 to b.readlines() to fix the error.

Here's the edited code.

from tkinter import *
import time

root = Tk()
root.title('Car Park')

v = StringVar()

car_in=Label(root, text= "Please enter your reg number")
car_in.grid(column=1, row=1)

reg_input=Entry(root, textvariable =v)
reg_input.grid(column=1, row=2)

def reg_input():
    with open ('tickets.txt', 'w') as b:
        b.writelines(v.get())

def reg_output():
    with open ('tickets.txt', 'r') as b:
        b.readlines()

reg_input_but=Button(root, text='Submit', command=reg_input)
reg_input_but.grid(column=1, row=4)

reg_output_b=Button(root, text='Get Ticket', command=reg_output)
reg_output_b.grid(column=1, row=5)

Upvotes: 0

Jannick
Jannick

Reputation: 1046

v is a Stringvar, therefore v.get() returns a string. b.readlines(lines) requires lines to be an integer because lines determines how many lines are supposed to be read. If you omit the argument it will read all lines.

Upvotes: 1

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