CODEWITHSUNDEEP
pythontkinter
user1730056
user1730056

Reputation: 623

Problems with Tkinter Entry and .get()

I'm having problems with my Tkinter Entry widget. I'm just testing things out and would like to have my callback print out whatever I typed out in Entry self.a. but I'm getting this error.

File "C:\Python27\lib\lib-tk\Tkinter.py", line 1410, in call return self.func(*args) File "C:/Users/Andy/testimage.py", line 146, in get print a.get(self) NameError: global name 'a' is not defined

I was wondering if someone can tell me what I'm doing wrong. I linked the callback function correctly because if I make it print "aasdfasd" instead, it will print that when I press the button. 

def clicked_wbbalance(self):
    self.top = Toplevel()
    self.top.title("LASKJDF...")
    Label(self.top, text="Enter low level").grid(row=0, column=0,padx=10)
    Label(self.top, text="Enter high level").grid(row=1, column=0,padx=10)
    Label(self.top, text="Values must be between 0 to 255").grid(row=3, column=0)
    Button(self.top, text="Ok", command=self.get).grid(row=3, column = 1)

    self.a =Entry(self.top).grid(row=0, column=1,padx=10)
    self.b =Entry(self.top).grid(row=1, column=1,padx=10)

def get(self):
    print self.a.get(self)

Upvotes: 0

Views: 1690

Answers (2)

Steven Rumbalski
Steven Rumbalski

Reputation: 45542

As RocketDonkey pointed out, your traceback does not match the code you posted.

Your code as written will generate a traceback like this:

AttributeError: 'NoneType' object has no attribute 'get'

The root problem is that grid returns None. That means that attributes a and b will be None because they are assigned the result of calls to grid. Fix that by puting object creation and widget placement on different lines:

self.a = Entry(self.top)
self.b = Entry(self.top)

self.a.grid(row=0, column=1,padx=10)
self.b.grid(row=1, column=1,padx=10)

Upvotes: 3

RocketDonkey
RocketDonkey

Reputation: 37249

You traceback says print a.get(self) NameError: global name 'a' is not defined, but the code you posted uses the syntax print self.a.get(self) (which would appear to be correct). Therefore if you check on line 146, you aren't prefacing a with self, meaning that instead of referencing the property a of the instance, you are trying to reference a on its own, which is not defined. Try adding self in front of a on line 146 and see if the problem continues.

Upvotes: 1

Related Questions