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Python Tkinker entry problem

mach1982

I've been playing around with python and tkinter, i'm trying to craeat a simple caulator , i got the GUI sorted ,I'm trying to get functionality working so I'm a test programme

I'm having problems get the input from the entry widget. To test this I have a function called get_input that is called when the button is pressed . Then it pass the input to a variable called a and printed to screen.

I keep getting and error

a=e1.get("1",END)
AttributeError: 'NoneType' object has no attribute 'get'

I googled and it said the variable wasn't declared so i set a="", but still not get the input.

Here the code

from Tkinter import *

root = Tk()


master = Frame(root)
master.pack()

# create entry widegt 
e1=Entry(master).grid(row=0)


# get the input from e1
def get_input():
	a=""
	a=e1.get("1",END)
	print a


  

# create buttun and add call back
button1 = Button(master, text="Pres Me",command=get_input)
button1.grid(row=1, column=1)



root.mainloop()

can some explain what I doing wrong,I'm new to python .

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mach1982

This isn't a homework problem i 'm just messing python, come on 21 people viewed, I've keep googleing but just can figure out the answer.Every time I've t I think I've solved up I come with that error. If some could explain what the error means then I might how to fix it , i've googled that too.

majestic0110

I am no Python Guru myself but I am under the impression that the error is related to you trying to use a variable that has not been defined. I would print out the value of :

e1=Entry(master).grid(row=0)

as my next step in troubleshooting this. I hope this helps at all, but like I said, I am no Python guru!

majestic0110

After some research, I might suggest you try to initialize e1 before you assign it the .grid function. I believe the .grid function returns a "NoneType", which would result in your error. Initialize e1 to the entry widget first, then assign it the return value of .grid. Something like this might work:

e1=Entry(master)
e1=grid(row=0)

I hope this helps.