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from Py Qt4 import Qt Gui import sys import design class Threading Tutorial(Qt Gui. Ui_Main Window): def __init__(self): super(self.__class__, self).__init__() self.setup Ui(self) def main(): app = Qt Gui.QApplication(sys.argv) form = Threading Tutorial() form.show() app.exec_() if __name__ == '__main__': main() So if you haven't worked with Py Qt or threading before you might be thinking: "Ok, I've got the reddit code, and I've got the GUI - I just call the reddit function and populate the data and it'll work" Well, it will technically work, but since the whole thing is one one main GUI thread your whole app will be frozen while the application/function executes.The subreddits argument will be stored in an instance variable called subreddits which then can be accessed by all other class instance functions :param subreddits: A list of subreddit names :type subreddits: list """ QThread.__init__(self) self.subreddits = subreddits def __del__(self): self.wait() def _get_top_post(self, subreddit): """ Return a pre-formatted string with top post title, author, and subreddit name from the subreddit passed as the only required argument.:param subreddit: A valid subreddit name :type subreddit: str :return: A string with top post title, author, and subreddit name from that subreddit. limit=1".format(subreddit) headers = request = urllib2. Request(url, headers=headers) response = urllib2.urlopen(request) data = json.load(response) top_post = data['data']['children'][0]['data'] return "'' by in ".format(**top_post) def run(self): """ Go over every item in the self.subreddits list (which was supplied during __init__) and for every item assume it's a string with valid subreddit name and fetch the top post using the _get_top_post method from reddit.Here's what will happen: from Py Qt4 import Qt Gui import sys import design import urllib2 import json import time class Threading Tutorial(Qt Gui. Ui_Main Window): def __init__(self): super(self.__class__, self).__init__() self.setup Ui(self) self.btn_start.clicked.connect(self.start_getting_top_posts) def _get_top_post(self, subreddit): url = "https://limit=1".format(subreddit) headers = request = urllib2. Request(url, headers=headers) response = urllib2.urlopen(request) data = json.load(response) top_post = data['data']['children'][0]['data'] return "'' by in ".format(**top_post) def _get_top_from_subreddits(self,subreddits): for subreddit in subreddits: yield self._get_top_post(subreddit) time.sleep(2) def start_getting_top_posts(self): subreddit_list = str(self.edit_subreddits.text()).split(',') if subreddit_list == ['']: Qt Gui.self.btn_Enabled(False) def add_post(self, post_text): """ Add the text that's given to this function to the list_submissions QList Widget we have in our GUI and increase the current value of progress bar by 1 :param post_text: text of the item to add to the list :type post_text: str """ self.list_Item(post_text) self.progress_Value(self.progress_bar.value() 1) def done(self): """ Show the message that fetching posts is done.

file on Git Hub's gist here: https://gist.github.com/Nikola-K/19d0c2b94c26200888bc (the whole project will also be linked at the bottom) Since this part isn't the focus of the tutorial I will skip any exception checking etc and just assume that the response from reddit will be valid.So we don't need to catch the # terminated one specifically, but we could if we wanted.self.connect(self.get_thread, SIGNAL("finished()"), self.done) # We have all the events we need connected we can start the thread self.get_thread.start() # At this point we want to allow user to stop/terminate the thread # so we enable that button self.btn_Enabled(True) # And we connect the click of that button to the built in # terminate method that all QThread instances have self.btn_stop.clicked.connect(self.get_thread.terminate) # We don't want to enable user to start another thread while this one is # running so we disable the start button. QApplication(sys.argv) form = Threading Tutorial() form.show() app.exec_() if __name__ == '__main__': main() That concludes this tutorial, if you have any specific questions you can always contact me by clicking "contact" on the main page.QMessage Box.critical(self, "No subreddits", "You didn't enter any subreddits.", Qt Gui. Ok) return self.progress_Maximum(len(subreddit_list)) self.progress_Value(0) for top_post in self._get_top_from_subreddits(subreddit_list): self.list_Item(top_post) self.progress_Value(self.progress_bar.value() 1) def main(): app = Qt Gui.QApplication(sys.argv) form = Threading Tutorial() form.show() app.exec_() if __name__ == '__main__': main() method to see whether the thread is still running in your code.

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a list, custom class, etc is to use from Py Qt4 import Qt Gui from Py Qt4.

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