python - Unexpected behaviour when setSortingEnabled(1) is called -

i have qtablewidget first column populated checkable items, needed overload items able sort them. sorting works expected when click on header of column (rows sorted - first there checked rows , not checked).

the problem occurs when run gui , not click on header of column sort table , this:

tablewidget.setsortingenabled(0);  // check/uncheck checkable items here tablewidget.setsortingenabled(1); 

in situation overridden __lt__ called 100+ times, not expect because didn't clicked on header of column sort. so, why __lt__ called? why compares checkable items if didn't clicked on header of column sort them?

please me, calling __lt__ consumes time when have 30+ rows.

from docs (c++ qt applies):

sortingenabled : bool

this property holds whether sorting enabled.

if property true, sorting enabled table. if property false, sorting not enabled. default value false.

note:. setting property true setsortingenabled() triggers call sortbycolumn() current sort section , order.

and if check docs of qheaderview (which queried widget know column sort by) can read:

int qheaderview::sortindicatorsection () const

returns logical index of section has sort indicator. default section 0.

see setsortindicator(), sortindicatororder(), , setsortindicatorshown().

and:

qt::sortorder qheaderview::sortindicatororder () const

returns order sort indicator. if no section has sort indicator return value of function undefined.

so should careful this