categorical_in_numeric_coords.py

import plotly.offline as py
import plotly.graph_objs as go
py.init_notebook_mode()

x = [8,10,6]
y = ['Kenya', 'Kosovo', 'Nigeria']
y_enum = list(range(len(y)))
worst_score, best_score = 7, 20

overhang = 0.25
bar_width=0.5
best_score_ref= go.Scatter(
    mode='lines',
    y=[-overhang, len(y) - 1 + overhang],
    x = [best_score] * 2,
)
worst_score_ref= go.Scatter(
    mode='lines',
    y=[-overhang, len(y) - 1 + overhang],
    x = [worst_score] * 2,
)

bar=go.Bar(x=x, y=y_enum, orientation='h', width=bar_width)

data=[bar, best_score_ref, worst_score_ref]

layout = go.Layout({'yaxis':{'tickmode': 'array', 'ticktext': y, 'tickvals': y_enum}})
fig = go.Figure(data=data, layout=layout)
py.iplot(fig)