poor: sort imports

poor_mans_visualisation.py

@@ -1,21 +1,17 @@
 #!/usr/bin/env python3
 
-import sys
-from birdvisu.providers import BirdSocketTopologyProvider, OspfFileTopologyProvider, OspfFileParseError
-ref_topo_file = 'reference.ospf'
-
-from birdvisu.topo_v3 import TopologyV3
-
-from birdvisu.topo_v3 import VertexID
 from birdvisu.annotations import AnnotatedTopology, AnnotatorID
 from birdvisu.annotations.analysis import TopologyDifference, ShortestPathTree
-from ipaddress import IPv4Address
+from birdvisu.providers import BirdSocketTopologyProvider, OspfFileTopologyProvider, OspfFileParseError
+from birdvisu.topo_v3 import TopologyV3, VertexID
 
 from PySide6 import QtCore, QtGui, QtWidgets
-app = QtWidgets.QApplication([])
-
-from random import randint
 from collections import defaultdict
+from ipaddress import IPv4Address
+from random import randint
+import sys
+
+app = QtWidgets.QApplication([])
 
 
 class MyGraphicsRectItem(QtWidgets.QGraphicsRectItem):