How do i add multiple events to a binding in tkinter - python-3.x

Question

I want to bind a widget to a single function so when its clicked and the "r" key is being pressed at the same time it gets called.
i have tryed <Button-1-R> and got the error "_tkinter.TclError: extra characters after detail in binding"
widged.bind("<Button-1>",function)

Answer 1

If you want to bind combinations, you can do so with a single bind by concatenating the events. You can optionally add whitespace between each event.
For example, to bind a click followed by pressing the "r" key you can do it like so:
widget.bind("<ButtonPress-1> <r>", function)
If you want the reverse -- the letter "r" followed by a click, just reverse them. However, you may have difficulties depending on your system since some systems have an autorepeat for keys.
widget.bind("<r><ButtonPress-1>", function).
It's important to know that tkinter processes events literally. For example, if you click the button and then press "r", the binding will fire. If you press "r" again the binding won't fire since it isn't immediately preceeded by a click.
It's unclear exactly what you're trying to accomplish, but the other solution is to set a flag in the handler for one event (either the click or the key), and check for the flag in the other.
For example:
def set_flag(value):
global flag
flag = True
def function(event):
if flag:
... process the event here ...
widget.bind("<ButtonPress-1>", lambda event: set_flag(True))
widget.bind("<ButtonRelease-1>", lambda event: set_flag(False))
widget.bind("<r>", function)

Answer 2

You can capture 3 events: <Button-1>, <r> and <ButtonRelease-1>. Fire your function only when both button 1 and r is triggered.
import tkinter as tk
root = tk.Tk()
entry = tk.Entry(root)
entry.insert(0,"Left click and press R")
entry.pack()
class Bindings:
def __init__(self):
self.but_1 = False
entry.bind("<Button-1>", self.mouse_clicked)
entry.bind("<r>", self.r_clicked)
entry.bind("<ButtonRelease-1>", self.mouse_release)
def mouse_release(self,event):
self.but_1 = False
def mouse_clicked(self,event):
self.but_1 = True
print ("Mouse button 1 clicked")
def r_clicked(self,event):
if self.but_1:
print ("Both keys clicked")
self.but_1 = False
else:
print ("Key R pressed")
Bindings()
root.mainloop()