Matplotlib Plotting: AttributeError: 'list' object has no attribute 'axhline'

Question

I'm plotting 3 charts in one figure.

The first chart came out fine and I could use the methods associated with a matplotlib chart.

fig = plt.figure(constrained_layout = True, figsize = [10,10])
gs = fig.add_gridspec(4,2)
fig_ax_curve = fig.add_subplot(gs[0:2,:])

However, as I proceeded with the second chart:

fig_ax_2_10 = fig.add_subplot(gs[2,:])
fig_ax_2_10 = fig_ax_2_10.plot(yield_history_2_10_30["2Y-10Y Spread"], label = "2Y - 10Y Spread", color = "red")
fig_ax_2_10.axhline(color = "black")

I was unable to execute any of the associated methods and got back:

AttributeError: 'list' object has no attribute 'axhline'

I am aware of an existing question that was similar: Matplotlib Plotting: AttributeError: 'list' object has no attribute 'xaxis'

If I'm not mistaken, my code has already followed what is suggested in that answer to avoid the error, specifically using ax.(methods)

Nico7as · Accepted Answer · 2020-03-03 16:35:26Z

1

The error comes from the line :

fig_ax_2_10 = fig_ax_2_10.plot(yield_history_2_10_30["2Y-10Y Spread"], label = "2Y - 10Y Spread", color = "red")

You are assigning the result of the plot function (a list of Line2D) to fig_ax_2_10. This is why you can not call axhline on that object.

Just replace :

fig_ax_2_10 = fig.add_subplot(gs[2,:])
fig_ax_2_10.plot(yield_history_2_10_30["2Y-10Y Spread"], label = "2Y - 10Y Spread", color = "red")
fig_ax_2_10.axhline(color = "black")

answered Mar 3, 2020 at 16:35

Nico7as

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