<｜begin▁of▁sentence｜>### Instruction:
Given a NetworkX directed graph with self-loops, how can you draw a loop edge using Plotly to visually represent edges that connect a node to itself as circular?
### Response:
import networkx as nx
import plotly.graph_objs as go
from plotly.offline import plot

# Create a NetworkX graph with self-loops
g = nx.MultiDiGraph()
g.add_node(1)
g.add_edge(1, 1)

# Function to draw a loop edge using Plotly
def draw_loop_edge(edge, vertex):
    loop_edge = go.Scatter(x=[vertex['x']], y=[vertex['y']],
                          text=[edge['label']],
                          mode='markers+text',
                          textposition='bottom center',
                          marker=dict(symbol='circle-open', size=20),
                          line=dict(width=2))
    return loop_edge

# Plot using Plotly
data = []
for u, v, k, data in g.edges(data=True, keys=True):
    vertex_pos = g.nodes[u]
    data['label'] = f'{u}->{v}'
    loop = draw_loop_edge(data, {'x':0, 'y':0})
    data.append(loop)

layout = {'title': 'Graph with Loop Edges'}
fig = go.Figure(data=data, layout=layout)
plot(fig, filename='loop_edges.html')
<|EOT|>
