How can I draw an energy ranking graph using Python?

I implemented an example that I suggested in the comments. This doesn't automatically scale the axis (I hardcoded it), and it doesn't add tick labels, but you should be able to find all of this in other questions.

import matplotlib.pyplot as plt
import numpy as np

def energy_rank(data, marker_width=.5, color='blue'):
    y_data = np.repeat(data, 2)
    x_data = np.empty_like(y_data)
    x_data[0::2] = np.arange(1, len(data)+1) - (marker_width/2)
    x_data[1::2] = np.arange(1, len(data)+1) + (marker_width/2)
    lines = []
    lines.append(plt.Line2D(x_data, y_data, lw=1, linestyle='dashed', color=color))
    for x in range(0,len(data)*2, 2):
        lines.append(plt.Line2D(x_data[x:x+2], y_data[x:x+2], lw=2, linestyle='solid', color=color))
    return lines

data = np.random.rand(4,8) * 4 # 4 lines with 8 datapoints from 0 - 4

artists = []
for row, color in zip(data, ('red','blue','green','magenta')):
    artists.extend(energy_rank(row, color=color))

fig, ax = plt.subplots()

for artist in artists:
    ax.add_artist(artist)
ax.set_ybound([0,4])
ax.set_xbound([.5,8.5])