I personally prefer to use lambdas in such a scenario, because imo it’s clearer and simpler and also doesn’t force you to write lots of wrapper methods if you don’t have control over the called method, but that’s certainly a matter of taste. That’s how you’d do it with a lambda (note there’s also some … Read more
Change your lambda to lambda i=i: self.open_this(i). This may look magical, but here’s what’s happening. When you use that lambda to define your function, the open_this call doesn’t get the value of the variable i at the time you define the function. Instead, it makes a closure, which is sort of like a note to … Read more
The correct answer is, use the validatecommand attribute of the widget. Unfortunately this feature is severely under-documented in the Tkinter world, though it is quite sufficiently documented in the Tk world. Even though it’s not documented well, it has everything you need to do validation without resorting to bindings or tracing variables, or modifying the … Read more
Why is it considered bad to have multiple instances of Tk? Tkinter is just a python wrapper around an embedded Tcl interpreter that imports the Tk library. When you create a root window, you create an instance of a Tcl interpreter. Each Tcl interpreter is an isolated sandbox. An object in one sandbox cannot interact … Read more
I advocate an object oriented approach. This is the template that I start out with: # Use Tkinter for python 2, tkinter for python 3 import tkinter as tk class MainApplication(tk.Frame): def __init__(self, parent, *args, **kwargs): tk.Frame.__init__(self, parent, *args, **kwargs) self.parent = parent <create the rest of your GUI here> if __name__ == “__main__”: root … Read more
Overview You can only associate scrollbars with a few widgets, and the root widget and Frame aren’t part of that group of widgets. There are at least a couple of ways to do this. If you need a simple vertical or horizontal group of widgets, you can use a text widget and the window_create method … Read more
The problem is your lambda expression in the for loop. It is using the name variable, but the name variable gets reassigned each iteration of the for loop, so in the end, all of the buttons get the last value that name was assigned to in the for loop. To avoid this you can use … Read more
One way is to stack the frames on top of each other, then you can simply raise one above the other in the stacking order. The one on top will be the one that is visible. This works best if all the frames are the same size, but with a little work you can get … Read more
The variable photo is a local variable which gets garbage collected after the class is instantiated. Save a reference to the photo, for example: self.photo = tkinter.PhotoImage(…) If you do a Google search on “tkinter image doesn’t display”, the first result is this: Why do my Tkinter images not appear? (The FAQ answer is currently … Read more
The grid, pack and place functions of the Entry object and of all other widgets returns None. In python when you do a().b(), the result of the expression is whatever b() returns, therefore Entry(…).grid(…) will return None. You should split that on to two lines like this: entryBox = Entry(root, width=60) entryBox.grid(row=2, column=1, sticky=W) That … Read more