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# Функции. Тут не все, есть и выше немного, но они не важны для моей проблемы.
 
def compare(forum_url):
    state1_list, state2_list = [], []
    list1 = get_info(forum_url, state1_list)
    time.sleep(10)
    list2 = get_info(forum_url, state2_list)
 
    if list1[2] != list2[2]:
        Sg.cprint(list2[2], '\n ')
        Sg.cprint(list2[3], '\n ')
    else:
        Sg.cprint('no new posts \n')
 
    state1_list.clear()
    state2_list.clear()
 
 
def compare_on_time(forum_url):
    schedule.every(1).seconds.do(compare, forum_url)
    while True:
        schedule.run_pending()
 
 
# Та часть GUI, которую я не могу написать. Второй event должен останавлиать первый.
        elif event == 'Follow Sales Ads':
            threading.Thread(target=compare_on_time,
                             args=('https://f...content-available-to-author-only...e.com/c/marketplace/sales-ads/',)).start()
        elif event == 'Stop following':
 

Traceback (most recent call last):
  File "/usr/lib/python3.7/py_compile.py", line 143, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 791, in source_to_code
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "./prog.py", line 26
    elif event == 'Follow Sales Ads':
       ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.7/py_compile.py", line 147, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 26
    elif event == 'Follow Sales Ads':
       ^
SyntaxError: invalid syntax

Standard output is empty