function - "else" statement executed before "if" statement after `undo` is used in Python -

i have created following function allows user change shape of python turtle image he/she selects file dialog file dialog pops when specific button pressed:

def turtleshape(iop = none):    # "iop" supposed image path    try:        manipulateimage.config(state = normal)        flipbutton.config(state = normal)        mirrorbutton.config(state = normal)        originalbutton.config(state = normal)        resetturtle.config(state = normal)        rotatebutton.config(state = normal)        global klob        # following "if-else" statement uses "iop" argument's value value "klob" if `iop` not `none`        if iop != none:            klob = iop            print("lmcv")        else:            klob = filedialog.askopenfilename()            print("klobby")        global im        im = image.open(klob)        pictures.append(im)        edited.clear()        print(im)        im.save(klob + '.gif', "gif")        register_shape(klob + '.gif')        shape(klob + '.gif')        update()    except:        pass 

the above function supposed use iop argument's value turtle's image if not none.

now, consider situation; draw bunch of things, set turtle image, , when stamp image, you accidentally press button resets turtle normal shape (yes, button exists in program). oh no! how without going through steps open , edit again? well, undohandler function (shown below) comes in. undoes last function called using many stacks, created deques. pretty straightforward if proficient in python:

def undohandler():    if len(function) > 0 , draw.drawing == true:       undohandler.handling = true       if not hasattr(undohandler, "counter"):          undohandler.counter = 0       undohandler.counter += 1       # clear canvas       clear()       # pop point object function deque       function.pop()       penup()       goto(-200, 100)       pendown()        try:           # execute point before last function called           in function:              # set canvas , turtle previous state              tsd = i.recieveshape()              shape(tsd)              mndf = i.recieveheading()              setheading(mndf)              hk = i.getletterheight()              global letter_height               letter_height = hk              rk = i.getletterwidth()              global letter_width              letter_width = rk              milk = i.getspacewidth()              global space_width              space_width = milk              hw = i.getwidth()              width(hw)              op = i.getcolor()              try:                 color(op)              except:                 g in colors:                    cp = g.getcolor2()                    colormode(255)                    color(cp)              # function wrapped in point object , execute              j = i.getfunction()              j()              # following code block issue occurs. basically, if function being run equal `turtleshape`, following...              if j.__name__ == "turtleshape":                  # `hfl` deque holds of `pictures` deque's contents cleared when turtle set default state                  pictures.extend(hfl)                  lmcv = pictures.pop()                  pictures.append(lmcv)                  try:                      # resize image previous size if user changes it. otherwise, skip this.                      bun = picwidth.pop()                      picwidth.append(bun)                      mun = picheight.pop()                      picheight.append(mun)                      clob = lmcv.resize((int(bun), int(mun)), image.antialias)                  except:                      clob = lmcv                  clob.save(klob + str(undohandler.counter) + ".gif")                  # use `clob.save` output above source image in `turtleshape` function (this issue occurs)                  turtleshape(klob + str(undohandler.counter) + ".gif")                  print("undone!")              else:                  pass       except:          pass 

basically happens here takes function (wrapped in point object) queue through main functions go through called. functions appended function deque, after which, when undohandler called user, screen gets cleared, , latest value popped function deque other actions except last 1 executed again. issue facing occurs in if j.__name__ == "turtleshape": code block. basically, reason, when user chooses undo resetting of turtle original shape, works should until turtleshape function executed undohandler. for reason, when undohandler executes turtleshape function, when give valid argument iop attribute of turtleshape function (as can see in if j.__name__ == "turtleshape": code block), else statement executed first (i.e. file dialog comes instead of continuing if statement). if user clicks cancel in dialog turtle set previous image.

what wrong in code leading occurrence, , how stop happening? have tried changing klob attribute in function output saved in undohandler function to, example, "saveimage", still no luck. have tried add if-elif statement in turtleshape when supposed choose between iop or file dialog value klob, still issue occurs. apparently, executes elif statement even when not true. therefore, appreciated in remedying issue! :)

it's happening here:

         j = i.getfunction()          j() 

if function you've gotten turtleshape() function, you're calling once default arguments (i.e., iop = none). go big if j.__name__ == "turtleshape": statement , call again inside if block.

move j() call else: block of big if j.__name__ == "turtleshape": statement, , problem should go away.

does brief explanation make enough sense understand why problem happening? or need me explain bit more in-depth how calling j() calling turtleshape parameter iop = none?