CODEWITHSUNDEEP
pythontkinter
user9575606
user9575606

Reputation:

my tkinter doesnt show up anything i have coded

i wrote this code, but when i run it it doesnt show any error, but the app is blank can you please show where i have done the mistake. Thank You

from tkinter import *
import csv

import os
os.chdir(r"C:\Users\Umer Selmani\Desktop\prog.practice\MP1")

root=Tk()
class Diet:
    def __init__(self,Tops,Lefts, Rights):

        self.Tops=Frame(root,width= 200,height=200).pack(side=TOP)

        self.Lefts=Frame(root,width= 200,height=200).pack(side=LEFT)

        self.Rights=Frame(root,width= 200,height=200).pack(side=RIGHT)

        self.label1=Label(Tops,font=("ariel","bold" ,20),text="Sehir Cafeteria",
                          bg="darkblue").grid(row=0,columns=0)

root.mainloop()

Upvotes: 0

Views: 48

Answers (2)

figbeam
figbeam

Reputation: 7176

You don't need to pass Tops, Lefts & Rights to the __init__() function if they are the frames you want to display. They are created in __init__().

The pack() function returns None which means you don't keep a reference to the respective frames. I have corrected this in my example.

To display the frames defined in the Diet class you must first create an instance.

I have color-coded the frames so they are visible.

from tkinter import *

class Diet:
    def __init__(self):
        self.Tops = Frame(root, width=400, height=200, bg='tan')
        self.Tops.pack(side=TOP)
        self.Tops.pack_propagate(False)
        self.Lefts = Frame(root, width= 200, height=200, bg='salmon')
        self.Lefts.pack(side=LEFT)
        self.Rights = Frame(root, width= 200, height=200, bg='bisque')
        self.Rights.pack(side=RIGHT)
        self.label1 = Label(self.Tops, font="ariel 20 bold",
                            text="Sehir Cafeteria", bg="darkblue")
        self.label1.pack(fill='x')
        # Grid() will shrink the self.Tops frame to exactly
        # fit the label.

root = Tk()
diet = Diet()   # Create an instance of Diet.

root.mainloop()

Additional explanation

Different return values from widget creation depending on how the code is written depends on how information is passed between objects:

# The first code:
self.Tops = Frame(root, width=400, height=200, bg='tan') 
    # Creates a Frame and associates it with the name "self.Tops"
self.Tops.pack(side=TOP) 
    # uses the geometry manager pack to display the frame "self.Tops" 
    # The method call returns the value: None
    # self.Tops is still referencing the frame

# The second code does the same thing but in a single compound statement
self.Tops = Frame(root, width=400, height=200, bg='tan').pack(side=TOP)
    # Creates a frame and passes a reference to that frame to pack.
    # Pack displays the label on the window and returns the value: None
    # This value is given the reference "self.Tops"

Try running the code below and examine the console printout. 

from tkinter import *

root = Tk()

label_a = Label(root, text='A')
return_a = label_a.pack()
print('label_a:', label_a)
print('return_a:', return_a)

label_b = Label(root, text='B').pack()
print('label_b:', label_b)

root.mainloop()

Hope this makes things clearer.

Upvotes: 0

Faquarl
Faquarl

Reputation: 335

You need to do

diet = Diet()
diet.pack()

Upvotes: 2

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