source: framspy/gui/widgets/ToolTip.py @ 1225

import tkinter as tk

class ToolTip(object):

    def __init__(self, widget):
        self.widget = widget
        self.tipwindow = None
        self.id = None
        self.x = self.y = 0

    def showtip(self, text, event):
        "Display text in a tooltip window"
        self.text = text
        if self.tipwindow or not self.text:
            return
        
        x = event.x_root + 5
        y = event.y_root + 5
        self.tipwindow = tw = tk.Toplevel(self.widget)
        tw.wm_overrideredirect(1)
        tw.wm_geometry("+%d+%d" % (x, y))
        label = tk.Label(tw, text=self.text, justify=tk.LEFT, background="#ffffe0", relief=tk.SOLID, borderwidth=1, font=("tahoma", "8", "normal"))
        label.pack(ipadx=1)

    def hidetip(self):
        tw = self.tipwindow
        self.tipwindow = None
        if tw:
            tw.destroy()

def CreateToolTip(widget, text):
    toolTip = ToolTip(widget)
    def enter(event):
        toolTip.showtip(text, event)
    def leave(event):
        toolTip.hidetip()
    widget.bind('<Enter>', enter)
    widget.bind('<Leave>', leave)