python - How to trigger a callback function when a button is pressed for a long time -

how can create callback long-time-pressed button? example, want save new value when press button more 2 seconds. there way this?

b3=tkinter.button(frames, text='1',font='agency 50', relief='groove',bd=5,width= 3, height=1) b3.bind("<button-1>", savep1) b3.bind("<buttonrelease-1>",savep11)    def savep1(event): dur()     if duration > 2:     update1()     clock[0]=time.time() else:     connection=sqlite3.connect('joimax.db')     cursor=connection.cursor()     sql = "select * speicherplatz name='save1'"     cursor.execute(sql)     dsatz in cursor:         scv.set(str(dsatz[2]))         direction.set(dsatz[1])         connection.close()         grafik()         print(' speed: ', str(dsatz[2])) 

just said, tried judge duration of 2 actions. there errors.

exception in tkinter callback traceback (most recent call last):   file "c:\python34\lib\tkinter\__init__.py", line 1533, in __call__     return self.func(*args)   file "c:\python34\Übung\gui4.py", line 147, in savep1     if duration > 2: nameerror: name 'duration' not defined 

update: solved problem yesterday. use after, , here code. causes little bit slow down of skript, better nothing.

def loop1():      global duration     if duration>2:         duration=0         update1()     else:         if press==false:             duration=0             do1()         else:             print('loop', duration)              duration=duration+timeit.timeit()+0.25             main.after(250, loop1)  def savep1(event):     global press     press=true     main.after(0,loop1)  def savep11(event):     global press     press=false 

i don't know how functions work here's quick example made should illustrate way this.

the first function call time.clock() , store global value (so second function can access it). function called when button first clicked.

the second function call time.clock() , calculate difference between , initial time.

if time greater 2.0 call third function; "save new value". used show done @ times >= 2.0 seconds

if time less 2 seconds print message time.

here's example code, hope solve problem.

from tkinter import * import tkmessagebox import time  root = tk() starttime = 0  def dostuff():      global starttime     starttime = time.clock()  def domore():      total = time.clock() - starttime     if total >= 2.0:         doevenmore(total)     else:         print("sorry, %5f seconds." %total)  def doevenmore(total):      # whatever after 2 seconds (save new value)     tkmessagebox.showinfo("congrats", "you held button down %.5f seconds!" %total)  b = button(root, text = "try me", justify = center) b.pack() # button down: start time b.bind("<button-1>", lambda event: dostuff()) # button up: end time, check if function or not b.bind("<buttonrelease-1>", lambda event: domore())  root.mainloop()