如何对齐 matplotlib 中的刻度标签？

Question

I'm trying to build an infographic using matplotlib, and I want to left-align all the y-axis' tick labels.

I want to move all the tick labels to the left — I want them all to begin from the same x-location as District of Columbia .

I tried to do that using Axes.set_yticklabels , but I can't figure out how to do it.

Answer 1

A flexible approach is to plot the labels separately, with ax.text() . Here is a simple example:

import matplotlib.pyplot as plt

y = [0, 1, 2]
width = [2, 2, 3]
labels = ['Colorado', 'Massachusetts', 'DC']

fig, ax = plt.subplots()
ax.barh(y=y, width=width)
ax.set_yticks(y)
ax.set_yticklabels([]) 

for i, yi in enumerate(y):
    ax.text(-0.8, yi, labels[i], horizontalalignment='left', verticalalignment='center')

Just adjust the offset ( -0.8 in the example above) according to your longest label.

Answer 2

Did you try using the set_horizontalalignment() for each tick on the axis?

for tick in ax.yaxis.get_majorticklabels():
    tick.set_horizontalalignment("left")