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Tkinter -- StringVar() not working correctly


While trying to initialize a StringVar() using TkInter I am getting this huge error back. So the error is as follows:

In [160]: from Tkinter import *

In [161]: p = StringVar()
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-161-3e21f17f6e4f> in <module>()
----> 1 p = StringVar()

C:\Python27\lib\lib-tk\Tkinter.pyc in __init__(self, master, value, name)
    285         then the existing value is retained.
    286         """
--> 287         Variable.__init__(self, master, value, name)
    288
    289     def get(self):

C:\Python27\lib\lib-tk\Tkinter.pyc in __init__(self, master, value, name)
    216             master = _default_root
    217         self._master = master
--> 218         self._tk = master.tk
    219         if name:
    220             self._name = name

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

In [162]:

Not entirely sure what is going wrong here. I am using A

Windows 7 system,

Python(x,y) version 2.7.5.2

Python 2.7.5

Within the Tkinter.py file:

__version__ = "$Revision: 81008 $" 

TkVersion = 8.5

If anyone has any clue as to what is going on, then it will be greatly appreciated ...


Solution

  • You need to create an instance of Tkinter.Tk before you create one of Tkinter.StringVar:

    root = Tk()  # You must do this first
    p = StringVar()
    

    Below is a demonstration:

    >>> from Tkinter import *
    >>>
    >>> p = StringVar()
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "C:\Python27\lib\lib-tk\Tkinter.py", line 287, in __init__
        Variable.__init__(self, master, value, name)
      File "C:\Python27\lib\lib-tk\Tkinter.py", line 218, in __init__
        self._tk = master.tk
    AttributeError: 'NoneType' object has no attribute 'tk'
    >>>
    >>> root = Tk()
    >>> p = StringVar()
    >>>