code styling: add comments and fix pep8

dijsktra.py

@@ -12,7 +12,9 @@ class Dijkstra():
         self.graph = graph
         self.table = {}
         for vertex in graph:
-            self.table.update({vertex: {"distance": (9999999, 999999), "prev": None}})
+            self.table.update({vertex: {
+                                 "distance": (9999999, 999999),
+                                 "prev": None}})
         self.table[connection[0]]["distance"] = (0, 0)
 
     def algorithm(self, switch: str):
@@ -21,6 +23,7 @@ class Dijkstra():
         print("Performing Dijkstra on the following graph...")
         for vertex in self.graph:
             print(f"{vertex}: {self.graph[vertex]}")
+            print("")
 
         for v1 in self.graph.keys():
             neighbors = self.graph[v1]
@@ -41,7 +44,7 @@ class Dijkstra():
                         self.table[key]["distance"] = (time, co2)
                         self.table[key]["prev"] = v1
 
-        print("self.table:", self.table)
+        print("Final Dijkstra table:", self.table)
 
     def print_result(self, connection: tuple):
         sequence = []