Use an enum to define the thread status

threads.py

@@ -0,0 +1,62 @@
+from enum import Enum, auto
+from io import BytesIO
+from os import mkdir
+import os.path
+from shutil import rmtree
+import urllib3
+from zipfile import ZipFile
+from PyQt5.QtCore import QThread
+import utilities
+
+class ThreadStatus(Enum):
+    ok = auto()
+    no_connection_err = auto()
+    no_file_err = auto()
+    bad_download_err = auto()
+
+class DownloadThread(QThread):
+    def __init__(self, db_location, path):
+        super().__init__()
+        self.__db_location = db_location
+        self.__path = path
+        self.__status = None
+        self.reason = 0
+
+    @property
+    def status(self):
+        return self.__status
+
+    def __del__(self):
+        self.terminate()
+        self.wait()
+
+    def run(self):
+        try:
+            db = urllib3.PoolManager().request('GET', self.__db_location)
+            # db = urllib.request.urlopen(self.__db_location)
+            # raise urllib.error.URLError('Test')
+        except urllib3.exceptions.MaxRetryError: # No internet connection.
+            # self.no_connection_error.emit()
+            self.__status = ThreadStatus.no_connection_err
+            return
+        if db.status != 200:
+            self.reason = db.reason
+            # self.bad_download_error.emit()
+            self.__status = ThreadStatus.bad_download_err
+            return
+        if not utilities.checksum_ok(db.data, "folder"):
+            # self.bad_download_error.emit()
+            self.__status = ThreadStatus.bad_download_err
+            return
+        if os.path.exists(self.__path):
+            rmtree(self.__path)
+        try:
+            # data_folder = db.read()
+            with ZipFile(BytesIO(db.data)) as zipped:
+                zipped.extractall()
+        except:
+            # self.bad_file_error.emit()
+            self.__status = ThreadStatus.bad_file_err
+            return
+        else:
+            self.__status = ThreadStatus.ok