[FIXED] How to get data from matplotlib bar chart

Issue

How does one retrieve data programmatically from a matplotlib bar chart? I can do it for a matplotlib line chart as follows, so maybe I'm fairly close:

import matplotlib.pyplot as plt

plt.plot([1,2,3],[4,5,6])

axis = plt.gca()
line = axis.lines[0]
x_plot, y_plot = line.get_xydata().T
print("x_plot: ", x_plot)
print("y_plot: ", y_plot)

for a bar chart, however, there are no lines, and I'm unclear what the equivalent object is:

plt.bar([1,2,3], [4,5,6])
axis = plt.gca()
???

FWIW, here are a couple of related postings (that don't go into bar charts):

• How to extract data from matplotlib plot
• Retrieve XY data from matplotlib figure

Solution

• The API for matplotlib.pyplot.bar returns a BarContainer object
  • matplotlib.patches.Rectangle provides a full accounting of the Patch methods.
  • This object is iterable, and the various location components can be extracted with the appropriate methods, as shown below.

import matplotlib.pyplot as plt

rects = plt.bar([1,2,3], [4,5,6])

for rect in rects:
    print(rect)
    xy = rect.get_xy()
    x = rect.get_x()
    y = rect.get_y()
    height = rect.get_height()
    width = rect.get_width()

[out]:
Rectangle(xy=(0.6, 0), width=0.8, height=4, angle=0)
Rectangle(xy=(1.6, 0), width=0.8, height=5, angle=0)
Rectangle(xy=(2.6, 0), width=0.8, height=6, angle=0)

Answered By - Trenton McKinney