[Tutor] Tkinter help?

[cartman6921]

*Below is a code made by me in 5 minutes, I am new to Tkinter so am kinda
noobish. as you can see, lemon equals 0 at the start and when you click the
button it adds 1 to the amount lemon equals. After about 15 minutes of
trying and 10 minutes googling i can find nothing to help me. when the code
loops, lemon is set back to 0 again, how do i stop lemon from being set back
to 0.

I need it so if you press the button eg 4 times, lemon=4*

from tkinter import *
root=Tk()

root.title("Lemonade Stand")
root.geometry("500x500+500+300")

lemon=0

def BuyLemon():
str(lemon)+str(1)
print(lemon)

button = Button(root,text="Buy Lemon x1", command=BuyLemon)
button.pack()

root.mainloop()




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[Alan Gauld]

Post by cartman6921
*Below is a code made by me in 5 minutes, I am new to Tkinter so am kinda
noobish.

We all have to start somewhere.

Unfortunately there are a few issues with your code.
I'll try to deal with them as we go through.

Post by cartman6921
from tkinter import *
root=Tk()
root.title("Lemonade Stand")
root.geometry("500x500+500+300")
lemon=0
str(lemon)+str(1)
print(lemon)

This function doesn't do what you think it does.
The second line takes the string representation of
lemon ('0') and adds the string representation of
1 ('1') using string concatenation to produce '01'

Then it throws it away.
Finally it prints lemon which remains unchanged as zero.

You need to have an assignment inside the function
that modifies lemon. But because you are modifying a
global variable you need to declare lemon as global
inside the function. So you get:

def buyLemon():
global lemon
lemon = str(lemon) + str(1)
print (lemon)

However if you just use that function you will wind
up, after 4 presses, with '01111' which is not what
you want.

Instead of converting to strings just add the numbers:

def buyLemon():
global lemon
lemon +=1
print (lemon)

Post by cartman6921
button = Button(root,text="Buy Lemon x1", command=BuyLemon)
button.pack()
root.mainloop()

Once you get that working your next step should be to get
the output printed on the GUI rather than the console. For
that you should probably start with a Label widget. You
can then assign the string representation of lemon to the
text attribute of the label.
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
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