CODEWITHSUNDEEP
pythontkinter
Lemuel Chen
Lemuel Chen

Reputation: 1

Python-TypeError: unbound method configure() must be called with Label instance as first argument (got nothing instead)

When I run the code, TK form should pop up But i am getting this error:

File "PycharmProjects/untitled/tkhello4.py", line 11, in resize
    Label.config(font='Helvetica -%d bold' % scale.get())
TypeError: unbound method configure() must be called with Label instance as first argument (got nothing instead)

What could be wrong? Thank you overmuch.

Below is my code.

from Tkinter import *


def resize(ev=None):
    Label.config(font='Helvetica -%d bold' % scale.get())

top = Tk()
top.geometry('250x150')

Lable = Label(top, text='Hello World!',
              font='Helvetica -12 bold')
Lable.pack(fill=Y, expand=1)

scale= Scale(top, from_=10, to=40,
             orient=HORIZONTAL, command=resize)
scale.set(12)
scale.pack(fill=X, expand=1)

quit = Button(top, text='QUIT', command=top.quit, activeforeground='white', activebackground='red')
quit.pack()
mainloop()

Upvotes: 0

Views: 548

Answers (2)

Mike - SMT
Mike - SMT

Reputation: 15236

Change the name of your label to something that is not part of a built in function.

Keep this in mind when naming any variable. If you confuse the name space things can get messy. Always write variable names in a way that will avoid messing with the built in functions or any imported functions.

just rename your Label like the following. It is always best to follow PEP-8 style guide to prevent this kind of problem.

def resize(ev=None):
    my_lable.config(font='Helvetica -%d bold' % scale.get())


my_lable = Label(top, text='Hello World!', font='Helvetica -12 bold')
my_lable.pack(fill=Y, expand=1)

Upvotes: 0

donkopotamus
donkopotamus

Reputation: 23216

You have a class Label and a variable Lable which seems a recipe for confusion ... which is exactly what has happened.

# here you refer to the class Label
Label.config(font='Helvetica -%d bold' % scale.get())

Should be

# but you should be using the instance Lable
Lable.config(font='Helvetica -%d bold' % scale.get())

Upvotes: 1

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