matplotlib line plot dont show vertical lines in step function

Question

I do have a plot that only consists of horizontal lines at certain values when I have a signal, otherwise none. So, I am looking for a way to plot this without the vertical lines. there may be gaps between the lines when there is no signal and I dont want the lines to connect nor do I want a line falling off to 0. Is there a way to plot this like that in matplotlib?

self.figure = plt.figure()
self.canvas = FigureCanvas(self.figure)
axes = self.figure.add_subplot(111)
axes.plot(df.index, df["x1"], lw=1.0, c=self.getColour('g', i), ls=ls)

Answer 1

The plot you are looking for is Matplotlib's plt.hlines(y, xmin, xmax).

For example:

import matplotlib.pyplot as plt

y = range(1, 11)
xmin = range(10)
xmax = range(1, 11)
colors=['blue', 'green', 'red', 'yellow', 'orange', 'purple', 
        'cyan', 'magenta', 'pink', 'black']

fig, ax = plt.subplots(1, 1)
ax.hlines(y, xmin, xmax, colors=colors)
plt.show()

Yields a plot like this:

See the Matplotlib documentation for more details.