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class Inv(tk.Frame):


    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
		
		table_frame = tk.LabelFrame(main_frame, bg='yellow', width=640, height=720)
		tk_table = ttk.Treeview(table_frame, columns=imp_df.columns.values)
		
		t_entry = tk.Entry(self, width=100)
        t_entry.insert(0,"ello")
		
		t_entry.pack()
        t_btn.pack()
		
		table_frame.pack(side='right', fill='y', expand=True, anchor='e', ipadx=150)
        table_frame.pack_propagate(0)
		tk_table.pack(anchor='center', expand=True, fill='both')

		tk_table.bind("<<TreeviewSelect>>", self.insert_info)

	def insert_info(self, event):
		t_entry.insert(0, "test insert text")

I have tried numerous setups, but I cannot call my test entry widget (t_entry) from another function. I am wanting my entry widgets populated with the data that is selected on the tk tree, but when declaring a new function:

def insert_info(self, event):
		t_entry.insert(0, "test insert text")

"t_entry" is never recognized. I understand this code won't work, but I typed it to give an example of what I am trying to achieve.

---

Solved it unexpectedly.

def insert_info(self, event):
        t_entry.insert(0, "test insert text")

needed to be

def insert_info(self, event):
        self.t_entry.insert(0, "test insert text")

I also had to declare "self" on all my previous widgets to be able to call any widget appropriately.

Here's the explanation as to why you had to do that:

In your original code, t_entry was a local variable inside the __init__() method. Therefore, when the method finished, it ceased to exist. Whereas, when you name it self.t_entry, it becomes an attribute of the Inv class and exists after the __init__() method has finished. Then, to call it up again, you treat it like any other class attribute and call up Inv.t_entry - which is self.t_entry within the methods of the Inv class.