python - Pyqt4 processEvents method causing memory leak -

i have code should update gui while calculating showing progress of calculation. know it's bad idea use processevents() method update gui. i should use threads so. however, curious memory leaks come from? if run code number of while loops big enough (like 10^(6)) memory usage jumps 1gb. can explain me?

from pyqt4 import qtgui  class calculus:     def __init__(self):         print "object created"      @staticmethod     def update_progress(self,value,ui_object):          ui_object.settext(qtgui.qapplication.translate("dialog", "progress: %s %%" % value, none))          #memory leak when updating (h=0.0001 , b=1000)         qtgui.qapplication.processevents() #update gui pyqt        @staticmethod     def euler(b,h,progress):         #progress ui object, label example.         actions_done = 0         actions_number = b * (1./h) #t = t+h. when h = 0.01 need perform t=t+h 100(1/h) times 1.                                      #when t varies 0 b, need multiply 1 * b(end time)                                     #so b * (1/h) number of actions perform          scale = actions_number * 0.01          while t <= b:             actions_done+=1             progress_value = (actions_done/actions_number)*100              if (actions_done % scale == 0):                 calculus.update_progress(none,progress_value, progress)                       t += h