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Using the .set_drawstyle method of a matplotlib.lines.Line2D fails if this line has been produced via plt.plot(). If the line is produced via plt.Line2D and subsequently added to the canvas, the output is as expected.
The following demonstrates this. We would expect to see the same step-like line in both subplots, but the right subplot, showing a line produced via plot, ignores its drawstyle.
import matplotlib.pyplot as plt
import numpy as np; np.random.seed(1)
x = np.linspace(0,1,20)
y = np.random.rand(len(x))
fig, (ax,ax2) = plt.subplots(ncols=2, figsize=(6,2.8))
line = plt.Line2D(x,y)
ax.add_artist(line)
line.set_drawstyle("steps-pre") # <-- this gives the desired step function
line2, = ax2.plot(x,y)
line2.set_drawstyle("steps-pre") # <-- this fails
plt.show()
[This is reproduced with matplotlib 2.1.2 on python 2.7 (64bit), windows 8.1 (64bit), both with TkAgg and Qt4Agg]
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