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How do I make a tkinter button destroy itself?

I made this program in Tkinter in python where a small window pops up when the code is run and a start button would pop up and make the window full screen and show the content after. I want to make the button destroy itself after I press it so it makes a fullscreen and removes the button. I am still a beginner and would like the answer to be simple. The solution I am looking for is to maybe destroy the button completely(preferred) or move it way out of sight in the fullscreen window. Here is the code:
import Tkinter as w
from Tkinter import *
w = Tk()
w.geometry("150x50+680+350")
def w1():
w.attributes("-fullscreen", True)
l1 = Label(w, text = "Loaded!", height = 6, width = 8).pack()
global b1
b1.place(x = -10000, y = -10000)
b1 = Button(w, text = "Start", height = 3, width = 20, command = w1).place(x = 0, y = 10)
b2 = Button(w, text = "Exit", command = w.destroy).place(x = 1506, y = 0)
w.mainloop()
As you can see I want to make button one destroy itself.

Try this:
import tkinter as tk # Use `import Tkinter as tk` for Python 2
root = tk.Tk()
root.geometry("150x50+680+350")
def function():
global button_start
root.attributes("-fullscreen", True)
label = tk.Label(root, text="Loaded!", height=6, width=8)
label.pack()
button_start.place_forget() # You can also use `button_start.destroy()`
button_start = tk.Button(root, text="Start", height=3, width=20, command=function)
button_start.place(x = 0, y = 10)
button_exit = tk.Button(root, text="Exit", command=root.destroy)
button_exit.place(x=1506, y=0)
root.mainloop()
PS: Please read this.

Try:
b1.place_forget()
This will essentially "forget" about the button and hide it from view.
Edit:
If you are getting the error that b1 is None try:
b1 = Button(w, text = "Start", height = 3, width = 20, command = w1)
b1.place(x = 0, y = 10)
You need to add the b1.place() option at the bottom for this to work

Random tkinter window opening on if/else statement

I'm wondering if I got my if else statement wrong or if its a tkinter issue. I want it so that if a 0 is left in any or all boxes, it gives an error message. But after the error message is closed, it opens a random blank window. This is my code. The specific area is the if else statement within the function valueget()
import tkinter as tk
def mainwindow():
mainwindow = tk.Tk()
mainwindow.title('Enter values')
mainwindow.geometry('160x110')
mainwindow.config(bg='#aaf0d1')
tk.Label(mainwindow, text = 'Enter a', font = ('verdana'), bg='#aaf0d1').grid(row=0)
tk.Label(mainwindow, text = 'Enter b', font = ('verdana'), bg='#aaf0d1').grid(row=1)
tk.Label(mainwindow, text = 'Enter c', font = ('verdana'), bg='#aaf0d1').grid(row=2)
getA = tk.IntVar()
aBox = tk.Entry(mainwindow, textvariable = getA, width=3, bg='#aaf0d1')
aBox.grid(row=0, column=1)
aBox.config(highlightbackground='#aaf0d1')
getB = tk.IntVar()
bBox = tk.Entry(mainwindow, textvariable = getB, width=3, bg='#aaf0d1')
bBox.grid(row=1, column=1)
bBox.config(highlightbackground='#aaf0d1')
getC = tk.IntVar()
cBox = tk.Entry(mainwindow, textvariable = getC, width=3, bg='#aaf0d1')
cBox.grid(row=2, column=1)
cBox.config(highlightbackground='#aaf0d1')
button = tk.Button(mainwindow, text='Obtain roots', command = lambda: valueget(), font = ('verdana'), highlightbackground='#aaf0d1')
button.grid(row=4)
button.config(bg='#aaf0d1')
def valueget():
readA = getA.get()
readB = getB.get()
readC = getC.get()
intA = int(readA)
intB = int(readB)
intC = int(readC)
negroot = (readB**2)-(4*readA*readC)
quadformulaplus = (-readB + (pow(negroot,0.5)))/(2*readA) #quad forumla
quadformulaminus = (-readB - (pow(negroot,0.5)))/(2*readA) #quad forumla
messagewindow = tk.Tk()
messagewindow.geometry('290x50')
messagewindow.title('Roots of the equation')
messagewindow.config(bg='#aaf0d1')
if readA == 0 or readB==0 or readC==0 or (readA==0 and readB==0 and readC==0):
errorwindow = tk.messagebox.showerror(message='none').pack()
else:
label = tk.Label(messagewindow, text = f'The roots are {quadformulaplus:.1f} and {quadformulaminus:.1f}', bg='#aaf0d1', font = ('verdana'))
label.grid(row=1)
closebutton = tk.Button(messagewindow, text='Close', command = lambda: messagewindow.destroy(), font = ('verdana'), highlightbackground='#aaf0d1')
closebutton.grid(row=2)
closebutton.config(bg='#aaf0d1')
messagewindow.mainloop()
# print(f'the roots are {quadformulaplus:.1f} and {quadformulaminus:.1f}')
mainwindow.mainloop()
def startup():
startpage = tk.Tk()
startpage.title('Solver')
photo = tk.PhotoImage(file = r"/Users/isa/Desktop/DiffEqns/cover.png") #image load
coverbutton = tk.Button(startpage, image = photo, command = lambda: [startpage.destroy(), mainwindow()])
coverbutton.pack()
coverbutton.configure(highlightbackground='#aaf0d1')
startpage.mainloop()
startup()

Here's a basic idea of what I would do:
import tkinter as tk
from tkinter import messagebox
def mainwindow(root):
# Creates a toplevel window
mainwindow = tk.Toplevel()
mainwindow.protocol("WM_DELETE_WINDOW", root.destroy) # This overrides the "X" being clicked to also destroy the root window.
root.withdraw() # "Hides" the root window, leaving it (and mainloop) running in the background.
mainwindow.title('Enter values')
mainwindow.geometry('160x110')
mainwindow.config(bg='#aaf0d1')
# Since all three of the labels/entries are the same
# we can save space by generating them in a loop
entry_items = ('Enter a', 'Enter b', 'Enter c')
values = []
for x, item in enumerate(entry_items): # Using enumerate and x to assign rows
tk.Label(mainwindow, text = item,
font = ('verdana'), bg='#aaf0d1').grid(row=x) # Row assigned to x.
values.append(tk.StringVar()) # Appended StringVar to list.
tk.Entry(mainwindow,
textvariable = values[-1], # Uses the last value appended to the values list.
highlightbackground='#aaf0d1',
width=3,
bg='#aaf0d1').grid(row=x, column=1) # Row assigned to x.
tk.Button(mainwindow,
text='Obtain roots',
command = lambda vals = values: valueget(vals), # Here the button command is assigned with the values list
font = ('verdana'), bg='#aaf0d1',
highlightbackground='#aaf0d1').grid(row=3) # we know there are 3 items before this.
mainwindow.lift() # This is a method of bringing a window to the front
def valueget(vals):
# This line gets the values from the StringVars, converts them to ints,
# and returns them to their respective variables.
try:
readA, readB, readC = [int(val.get()) for val in vals]
except ValueError:
messagebox.showerror(title="Number Error", message='Values must be numbers')
return
# Here the variables are checked to see if they are 0
# Since each one is being checked if it is 0, there is no need to check if they are all 0.
for val in (readA, readB, readC):
if val == 0:
# If they are 0, shows an error message
messagebox.showerror(title="Zero Error", message='Values must not be zero')
return
# Creates a toplevel to display the results
messagewindow = tk.Toplevel()
messagewindow.title('Roots of the equation')
messagewindow.config(bg='#aaf0d1')
negroot = (readB**2)-(4*readA*readC)
quadformulaplus = (-readB + (pow(negroot,0.5)))/(2*readA) #quad forumla
quadformulaminus = (-readB - (pow(negroot,0.5)))/(2*readA) #quad forumla
tk.Label(messagewindow,
text = f'The roots are {quadformulaplus:.1f} and {quadformulaminus:.1f}',
bg='#aaf0d1',
font = ('verdana')).pack(padx = 5, pady = 2)
tk.Button(messagewindow,
text='Close',
command = messagewindow.destroy, # There is no need for a lambda for this.
font = ('verdana'),
bg = '#aaf0d1',
highlightbackground='#aaf0d1').pack(padx = 5, pady = 2)
# print(f'the roots are {quadformulaplus:.1f} and {quadformulaminus:.1f}')
messagewindow.lift() # This is a method of bringing a window to the front
def startup():
startpage = tk.Tk()
startpage.title('Solver')
# COMMENTED OUT FOR TESTING
#photo = tk.PhotoImage(file = r"/Users/isa/Desktop/DiffEqns/cover.png") #image load
coverbutton = tk.Button(startpage,
# COMMENTED OUT FOR TESTING
#image = photo,
text = "TESTING", # HERE FOR TESTING
highlightbackground='#aaf0d1',
command = lambda root = startpage: mainwindow(root)).pack() # Passes the startpage to the mainwindow function.
startpage.mainloop() # The only mainloop you need.
startup()

I would recommend to improve the readability of the if-else statement for a start.
coefficients = [readA, readB, readC]
if sum(coefficients): # If they all are all zeros this will be False
if min(coefficients): # If any one is zero, this will be False
label = tk.Label(messagewindow, text = f'The roots are {quadformulaplus:.1f} and {quadformulaminus:.1f}', bg='#aaf0d1', font = ('verdana'))
label.grid(row=1)
closebutton = tk.Button(messagewindow, text='Close', command = lambda: messagewindow.destroy(), font = ('verdana'), highlightbackground='#aaf0d1')
closebutton.grid(row=2)
closebutton.config(bg='#aaf0d1')
else:
errorwindow = tk.messagebox.showerror(message='none').pack()
else:
errorwindow = tk.messagebox.showerror(message='none').pack()

Python Tkinterprogramm import to a new file throws a error

i have a problem with the user-output of my tkinter gui.
First of all it works, but there is a huge problem with the import to a new py file. It throws a Error ().
Traceback (most recent call last):
File "F:\Python_Projekt\Übung\Plus\test.py", line 4, in <module>
tk = own.get_start()
File "F:\Python_Projekt\Übung\Plus\plus_window_pack2.py", line 31, in get_start
sel = ListBox1.curselection()
File "C:\Users\nox\AppData\Local\Programs\Python\Python36-32\lib\tkinter\__init__.py", line 2782, in curselection
return self._getints(self.tk.call(self._w, 'curselection')) or ()
_tkinter.TclError: invalid command name ".!frame.!frame.!listbox"
I know there is a problem with my ListBox but i have no clue how to handle it. I need the used output for my new script. So i could work with it.
from tkinter import*
import tkinter as tk
window = Tk()
rahmen1 = Frame(master = window) #, bg='black'
rahmen1.pack(side='top', padx=5, pady=5)
rahmen2 = Frame(master = rahmen1) #, bg= 'yellow'
rahmen2.pack(side='left', padx=5, pady=5)
def get_start():
selection=ListBox1.curselection()
picked = selection[0]
used = ListBox1.get(picked) #-------user-input
print(used)
return used
####################----------------------------------------------------
List = ['Dax','Dow','EUR/USD', 'Gold', 'Silber','EUR/JPY','USD/JPY']
scrollbar1 = Scrollbar(rahmen2) # ,bg='green'
scrollbar1.pack(padx = 1,side = 'right',fill=Y)
ListBox1 = Listbox(rahmen2,exportselection = False)
ListBox1.config( yscrollcommand = scrollbar1.set, width = 40)
scrollbar1.config( command = ListBox1.yview) # ,bg='blue'
for i in List:
ListBox1.insert(tk.END, str(i))
ListBox1.pack(padx = 1,)
###################------------------------------------------------
Button1 = Button(rahmen2,text='Get Data', font = 'bold')
Button1.config (width=40, height = 3, command = get_start)
Button1.pack( )
window.mainloop()
I changed the code to get the important part. For a better understanding of my problem.
if i want to get the user-input it thorw's me the error.

Try this. I have added a simple check to make sure something's selected (I'm not sure what the error at the top of your question's about though):
def get_start():
selection=ListBox1.curselection()
if len (selection) != 0:
picked = selection[0]
used = ListBox1.get(picked) #-------user-input
print(used)
return used
EDIT:
This checks every x seconds (defined by UPDATE_TIME) for checkbox updates
UPDATE_TIME = 0.1
from tkinter import*
import tkinter as tk
import threading, time
window = Tk()
rahmen1 = Frame(master = window) #, bg='black'
rahmen1.pack(side='top', padx=5, pady=5)
rahmen2 = Frame(master = rahmen1) #, bg= 'yellow'
rahmen2.pack(side='left', padx=5, pady=5)
def get_start():
print (previous)
return previous
def get_update ():
global previous
try:
while True:
selection=ListBox1.curselection()
if len (selection) == 0: previous = None
else:
picked = selection[0]
previous = ListBox1.get(picked) #-------user-input
time.sleep (UPDATE_TIME)
except: pass
####################----------------------------------------------------
List = ['Dax','Dow','EUR/USD', 'Gold', 'Silber','EUR/JPY','USD/JPY']
scrollbar1 = Scrollbar(rahmen2) # ,bg='green'
scrollbar1.pack(padx = 1,side = 'right',fill=Y)
ListBox1 = Listbox(rahmen2,exportselection = False)
ListBox1.config( yscrollcommand = scrollbar1.set, width = 40)
scrollbar1.config( command = ListBox1.yview) # ,bg='blue'
for i in List:
ListBox1.insert(tk.END, str(i))
ListBox1.pack(padx = 1,)
###################------------------------------------------------
Button1 = Button(rahmen2,text='Get Data', font = 'bold')
Button1.config (width=40, height = 3, command = get_start)
Button1.pack ()
threading.Thread (target = get_update).start ()
window.mainloop()

How would I create a reset button for my program relating with the following code?

I am trying to add a reset button but I can't seem to get it to work. I created a main in order to refer back to it when the button is pressed but no luck. Any ideas?
import sys
from tkinter import *
import math
def main():
def closeWin():
myGui.destroy() #Close Window Function
def kiloFunc():
myText = kiloMent.get() #Kilometers to Miles Fuction
convert = 0.62
miles = myText * convert
finalKilo = Label(text = miles,fg='red',justify='center').place(x=200,y=80)
def mileFunc():
myText2 = mileMent.get() #Miles to Kilometers Function
convertTwo = myText2 // 0.62
finalMile = Label(text = convertTwo, fg = 'red',justify='center').place(x=200,y=170)
myGui = Tk()
kiloMent = IntVar()
mileMent = IntVar()
myGui.title("Distance Converter")
myGui.geometry("450x200+500+200")
myLabel = Label(text="Welcome! Please enter your value then choose your option:",fg="blue",justify='center')
myLabel.pack()
kiloEntry = Entry(myGui, textvariable = kiloMent,justify='center').pack()
kilo2milesButton = Button(text = "Kilometers to Miles!", command = kiloFunc).pack()
mileEntry = Entry(myGui, textvariable = mileMent,justify='center').place(x=130,y=105)
miles2kiloButton = Button(text = "Miles to Kilometers!", command = mileFunc).place(x=150,y=135)
reset = Button(text = "Reset Values!", command = main).place(x=10,y=165)
quit = Button(text="Quit", command = closeWin).place(x=385,y=165)
myGui.mainloop()
main()

By calling main() again, you are simply creating another instance of the GUI. What you should do instead is (if I understand correctly), reset the values of the currently existing GUI. You can use the set() method of the GUI objects.
Does
def reset_values():
kiloMent.set(0)
mileMent.set(0)
reset = Button(text="Reset Values!", command=reset_values).place(x=10, y=165)
do the trick?
Looking at your code more thoroughly, however, there are some other problems there, as well. To start with, I would suggest not creating a Label everytime the user tries to convert a value.

This code should work:
from tkinter import *
def main():
def closeWin():
myGui.destroy() # Close Window Function
def kiloFunc():
finalKilo.set(kiloMent.get() * 0.62) # Kilometers to Miles Fuction
def mileFunc():
finalMile.set(mileMent.get() // 0.62) # Miles to Kilometers Function
def clearFunc():
kiloMent.set("0")
mileMent.set("0")
finalKilo.set("")
finalMile.set("")
myGui = Tk()
kiloMent = IntVar()
mileMent = IntVar()
finalKilo = StringVar()
finalMile = StringVar()
myGui.title("Distance Converter")
myGui.geometry("450x200+500+200")
myLabel = Label(text="Welcome! Please enter your value then choose your option:", fg="blue", justify='center')
myLabel.pack()
kiloEntry = Entry(myGui, textvariable=kiloMent, justify='center')
kiloEntry.pack()
kilo2milesButton = Button(text="Kilometers to Miles!", command=kiloFunc)
kilo2milesButton.pack()
mileEntry = Entry(myGui, textvariable=mileMent, justify='center')
mileEntry.place(x=130, y=105)
miles2kiloButton = Button(text="Miles to Kilometers!", command=mileFunc)
miles2kiloButton.place(x=150, y=135)
kiloLabel = Label(textvariable=finalKilo, fg='red', justify='center')
kiloLabel.place(x=200, y=80)
mileLabel = Label(textvariable=finalMile, fg='red', justify='center')
mileLabel.place(x=200, y=170)
reset = Button(text="Reset Values!", command=clearFunc)
reset.place(x=10, y=165)
quit = Button(text="Quit", command=closeWin)
quit.place(x=385, y=165)
myGui.mainloop()
main()
A few notes about your original code besides the ones that Chuck mentioned:
The math and sys imports were unused.
You were setting variables equal to widget.pack() and widget.place(), which are functions that return None.

Python tkinter: access child widgets of a widget

I have a string 'currentMessage' and a Label to display it.
I have a Toplevel widget, which contains a Text widget to provide new value for 'currentMessage':
from tkinter import *
from tkinter import ttk
root = Tk()
mainFrame = ttk.Frame(root)
mainFrame.grid()
currentMessage = 'current Message'
ttk.Label(mainFrame, text = currentMessage).grid(padx = 10, pady = 10)
def updateCurrentMessage(popupWindow):
currentMessage = popupWindow.textBox.get(0.0, END)
def changeValues():
popup = Toplevel(mainFrame)
popup.grid()
textBox = Text(popup, width = 20, height = 5)
textBox.grid(column = 0, row = 0)
textBox.insert(END, 'new message here')
b = ttk.Button(popup, command = lambda: updateCurrentMessage(popup))
b.grid(column = 0, row = 1, padx = 5, pady = 5)
b['text'] = 'Update'
theButton = ttk.Button(mainFrame, command = changeValues, text = 'Click')
theButton.grid(padx = 10, pady = 10)
mainFrame.mainloop()
I tried to get the content of 'textBox' Text widget of the Toplevel by using this function:
def updateCurrentMessage(popupWindow):
currentMessage = popupWindow.textBox.get(0.0, END)
But I got an error
'Toplevel' object has no attribute 'textBox'
So how do I access content of the widget 'textBox', which is a child widget of 'popup' (this Toplevel widget is only created when function changeValues() is called)?

I think probably this is what you are looking for -- although I'm just guessing, because you are asking for a solution for a specific problem you think you have, however if I were you I would rethink what exactly do I want to do:
from tkinter import *
from tkinter import ttk
# Create Tk Interface root
root = Tk()
# Initialize mainFrame
mainFrame = ttk.Frame( root )
mainFrame.grid()
# Initialize label of mainframe
theLabel = ttk.Label( mainFrame, text='Current Message' )
theLabel.grid( padx=10, pady=10 )
def createPopup():
# Initialize popup window
popup = Toplevel( mainFrame )
popup.grid()
# Initialize text box of popup window
textBox = Text( popup, width=20, height=5 )
textBox.grid( column = 0, row = 0 )
textBox.insert( END, 'New Message Here' )
# Initialize button of popup window
button = ttk.Button( master = popup,
command = lambda: theLabel.config(text=textBox.get(0.0, END)),
text = 'Update')
button.grid( column=0, row=1, padx=5, pady=5 )
# Initialize button of main frame
theButton = ttk.Button( mainFrame, command=createPopup, text='Click' )
theButton.grid( padx=10, pady=10 )
# Enter event loop
mainFrame.mainloop()

There is a way indeed, like this:
def updateCurrentMessage(popupWindow):
currentMessage = popupWindow.nametowidget('textBox').get(0.0, END)
def changeValues():
popup = Toplevel(mainFrame)
popup.grid()
textBox = Text(popup, width = 20, height = 5, name = 'textBox')
textBox.grid(column = 0, row = 0)
textBox.insert(END, 'new message here')
b = ttk.Button(popup, command = lambda: updateCurrentMessage(popup))
b.grid(column = 0, row = 1, padx = 5, pady = 5)
b['text'] = 'Update'
You can choose whatever you want for the 'name'.