# can you explain me the code i ammentioning

#Practical 1 : BFS
class Vertex:
def __init__(self,n):
self.name=n
self.neighbors=list()

self.distance=9999
self.color='blue'
if v not in self.neighbors:
self.neighbors.append(v)
self.neighbors.sort()

class Graph:
vertices={}
if isinstance (vertex,Vertex) and vertex.name not in self.vertices:
self.vertices[vertex.name]=vertex
return True
else:
return False

if u in self.vertices and v in self.vertices:
for key,value in self.vertices.items():
if key==u:
if key==v:
return True
else:
return False

def print_graph(self):
for key in sorted(list(self.vertices.keys())):
print(key +str(self.vertices[key].neighbors)+""+str(self.vertices[key].distance))
def bfs(self,vert):
q=list()
vert.distance=0
vert.color='red'
for v in vert.neighbors:
self.vertices[v].distance=vert.distance + 1
q.append(v)
while len(q)>0:
u=q.pop(0)
node_u=self.vertices[u]
node_u.color='red'

for v in node_u.neighbors:
node_v=self.vertices[v]
if node_v.color=='black':
q.append(v)
if node_v.distance > node_u.distance + 1:
node_v.distance=node_u.distance + 1

g=Graph()
a=Vertex('A')
for i in range(ord('A'),ord('K')):