[Tkinter] Clearing Text in Tkinter

[icabero0225]

You need to use textvariable

You need to change your structure in how you are doing things. For example you are creating a new label every time you callback, instead just make the one label, and set it in the callback. Also you should really consider using classes (OOP).

Here is a small example using textvariable. Keep pressing the button and the label changes based on the current epoch timestamp.

import tkinter as tk
import time

def callback():
    lbl.set('{}'.format(time.time()))
    
root = tk.Tk()
lbl = tk.StringVar()
lbl.set('default')
tk.Label(root, textvariable=lbl).pack()
tk.Button(root, text="Get Time", command=callback).pack()


root.mainloop()
    

Thank you so much, after reading some documentation I decided to rewrite the program. Here it is:

from tkinter import *

global datr,dzd,dzp,szp,szd,wr,sl,rsk,rwd,t1,t2

def buy():
    datr = float(datrEntry.get())
    dzd = float(dzdEntry.get())
    dzp = float(dzpEntry.get())
    szp = float(szpEntry.get())
    szd = float(szdEntry.get())
    wr = (datr * 0.02)
    sl = (dzd - wr)
    rsk = (dzp - sl)
    rwd = (rsk * 3)
    t1 = (dzp + rwd)
    t2 = szp

    orderLbl.set("Buy")
    dzpLbl.set(dzd)
    slLbl.set(sl)
    t1Lbl.set(t1)

def sell():
    datr = float(datrEntry.get())
    dzd = float(dzdEntry.get())
    dzp = float(dzpEntry.get())
    szp = float(szpEntry.get())
    szd = float(szdEntry.get())
    wr = (datr * 0.02)
    sl = (szd + wr)
    rsk = (sl - szp)
    rwd = (rsk * 3)
    t1 = (szp - rwd)
    t2 = dzp

    orderLbl.set("Sell")
    szpLbl.set(szp)
    slLbl.set(sl)
    t1Lbl.set(t1)

root=Tk()
root.title("Trading Engine")
root.resizable(width=False, height=False)

#DATR
Label(root, text="Daily Average True Range").grid(row=2, column=0,sticky=E)
datrEntry = Entry(root)
datrEntry.grid(row=2,column=1)
datrEntry.focus_set()
#DZD
Label(root, text="Demand Zone Distal").grid(row=4, column=0,sticky=E)
dzdEntry = Entry(root)
dzdEntry.grid(row=4,column=1)
#DZP
Label(root, text="Demand Zone Proximal").grid(row=6, column=0,sticky=E)
dzpEntry = Entry(root)
dzpEntry.grid(row=6,column=1)
#SZP
Label(root, text="Supply Zone Proximal").grid(row=8, column=0,sticky=E)
szpEntry = Entry(root)
szpEntry.grid(row=8,column=1)
#SZD
Label(root, text="Supply Zone Distal").grid(row=10, column=0,sticky=E)
szdEntry = Entry(root)
szdEntry.grid(row=10,column=1)
#Entries
datrLbl = StringVar()
dzdLbl = StringVar()
dzpLbl = StringVar()
szpLbl = StringVar()
szdLbl = StringVar()
slLbl = StringVar()
t1Lbl = StringVar()
orderLbl = StringVar()

Button(root, text="Buy", command=buy,bg="green").grid(sticky=W)
Button(root, text="Sell", command=sell,bg="red").grid(sticky=W)

Label(root).grid(row=12,column=0)#blank space
orderLbl.set("")
dzpLbl.set("")
slLbl.set("")
t1Lbl.set("")


Label(root, text="Order Type: ").grid(row=14,column=0,sticky=W)
Label(root, textvariable=orderLbl).grid(row=14,column=1,sticky=W)
Label(root).grid(row=16, column=0) # Blank space
Label(root, text="Entry: ").grid(row=18, column=0, sticky=W)
Label(root, textvariable=dzpLbl).grid(row=18, column=1, sticky=W)
Label(root, text="Stop Loss: ").grid(row=20, column=0, sticky=W)
Label(root, textvariable=slLbl).grid(row=20, column=1, sticky=W)
Label(root, text="Target: ").grid(row=22, column=0, sticky=W)
Label(root, textvariable=t1Lbl).grid(row=22, column=1, sticky=W)

root.geometry("500x500")
#root.geometry("330x250")
root.mainloop()