Tkinter ValueError when converting seconds to minutes?

Question

So, I'm working on a timer using Python and Tkinter's GUI. To do so, I intend to convert the minutes into seconds (as seen in my code) and use Python's time.sleep command to count down (not yet implemented).

from tkinter import *
import time
countdown = Tk()
countdown.geometry('500x300')
minute = Text(countdown, height = 0.01, width = 5)
minute.place(x=100, y=100)
minlabel = Label(text = "Input Minutes", font = ("MS Sans Serif", 10), bg = 'Light Blue')
minlabel.place(x=85, y = 80)
def go(event):
    minseconds = int(minute.get("1.0", END))*60
    print(int(minseconds)) 
countdown.bind('<Return>', go)
countdown.mainloop()

However, when I convert it to minutes, it works the first time (I.E, when I input 3, 180 returns), but any time after that I get this:

ValueError: invalid literal for int() with base 10: '3\n3\n\n'

Any idea what could be causing this? And why it works the first time but then stops working? Thanks :)

this '3\n3\n\n' contains more than numbers. '\n' means a line break point, you need to filter the string in the way you want to work with. Maybe dont use tk.END rather an known index. — Thingamabobs
– Thingamabobs, Commented May 31, 2021 at 13:51

martineau · Accepted Answer · 2021-05-31 15:19:02Z

2

The problem is every time Enter is pressed a newline character is entered into the Text widget named minute and they mess up the conversion to int.

The simplest way I can think of to avoid that would be to just clear the widget in the event handler function:

def go(event):
    minseconds = int(minute.get("1.0", END))*60
    print(int(minseconds))
    minute.delete('1.0', END)  # <---- ADDED.

answered May 31, 2021 at 15:19

martineau

124k29 gold badges181 silver badges319 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

steTATO · Accepted Answer · 2021-05-31 15:01:49Z

so actually the error is quite simple. You created a Text widget, which is just adding lines when you press Enter (corresponding to the \n characters). Just make your text widget bigger (instead of height = 0.01 maybe 2) and you will see it.

To do it more elegantly, you might try Entry() instead of Text(). See the example.

import time
import tkinter as tk

def go(event):
    minseconds = int(min_entry.get())
    seconds = minseconds*60
    print(int(seconds))

countdown = tk.Tk()
countdown.geometry('500x300')

minlabel = tk.Label(text = "Input Minutes", font = ("MS Sans Serif", 10), bg = 'Light Blue')
minlabel.place(x=85, y = 80)
min_entry = tk.Entry()
min_entry.place(x=100, y=100)

countdown.bind('<Return>', go)
countdown.mainloop()

Furthermore try to put your functions always on top of your code, as they have to be defined before you call them. This might be causing trouble as you code gets bigger.

Hope you get a better understanding from tkinter by this :)

score 1 · Accepted Answer · 2021-05-31 15:48:43Z

Check this update function. Import the module at top

import messagebox as msg
def go(event):
    try:
        minseconds = int(minute.get("1.0", END))*60
        print(int(minseconds)) 
        minute.delete("1.0", END)
   except Exception:
        msg.showerror("Error","invalid input provided.")
        minute.delete("1.0", END)

But I would suggest to go with Entry With a StringVar()

from tkinter import *
from tkinter import messagebox as msg
countdown = Tk()
countdown.geometry('500x300')
minute=StringVar()
minut = Entry(countdown,textvariable=minute, width = 5)
minut.place(x=100, y=100)
minlabel = Label(text = "Input Minutes", font = ("MS Sans Serif", 10), bg = 'Light Blue')
minlabel.place(x=85, y = 80)
def go(event):
    try:
        minseconds = int(minute.get())*60
        print(int(minseconds)) 
        minute.set("")
    except ValueError:
        msg.showerror("Error","Invalid input provided.")
countdown.bind('<Return>', go)
countdown.mainloop()

Collectives™ on Stack Overflow

Tkinter ValueError when converting seconds to minutes?

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related