<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _update_gui_text_tabs(self):

 """Iterates through pages to update tab texts"""

        for index, page in enumerate(self.pages):
            self.tabWidget.setTabText(index, "{} (Alt+&{}){}".format(page.text_tab, index+1, (" (changed)" if page.flag_changed else "")))