title: Can I double-click a tkinter Listbox option to invoke function in Python?
body: <p>I have a Listbox with an associated "Select" button. I want my GUI such that a double-click on any Listbox value invokes this button's command. My attempt (below) works when an option is selected and the user double-clicks ANYWHERE in the window. I want it to work only when the selection itself (blue highlighted row) is being double-clicked.</p>
  
  <p>What is the best way to do this?</p>
  
  <pre><code>from tkinter import *
  
  def func1():
      print("in func1")
  
  def func2():
      print("in func2")
  
  def selection():
      try:
          dictionary[listbox.selection_get()]()
      except:
          pass
  
  root = Tk()
  
  frame = Frame(root)
  frame.pack()
  
  dictionary = {"1":func1, "2":func2}
  
  items = StringVar(value=tuple(sorted(dictionary.keys())))
  
  listbox = Listbox(frame, listvariable=items, width=15, height=5)
  listbox.grid(column=0, row=2, rowspan=6, sticky=("n", "w", "e", "s"))
  listbox.focus()
  
  selectButton = Button(frame, text='Select', underline = 0, command=selection)
  selectButton.grid(column=2, row=4, sticky="e", padx=50, pady=50)
  
  root.bind('&lt;Double-1&gt;', lambda x: selectButton.invoke())
  
  root.mainloop()
  </code></pre>