PYTHON

horizontal line matplotlib python

import matplotlib.pyplot as plt
plt.axhline(0)

horizontal line for pyplot

import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(1, 21, 200)
y = np.exp(-x)

fig, ax = plt.subplots()
ax.plot(x, y)
ax.hlines(y=0.2, xmin=4, xmax=20, linewidth=2, color='r')

plt.show()

plot horizontal line in python

This will plot y=0 horizontal line , 
import matplotlib.pyplot as plt
plt.axhline(0)

python plot horizontal line

import matplotlib.pyplot as plt
series.plot(kind='barh')
plt.show()