split tick labels or wrap tick labels [duplicate]

textwrap is the way to go. More precise the function textwrap.fill(). You haven’t posted the error message you got, but I do assume you passed the whole array labels to fill() which will cause an error message. Use list comprehension instead to pass each individual label to fill() and it will work.

x_axis=range(5)
labels = ['abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'] * len(x_axis)

plt.title('param')
plt.ylabel('Measurement')
# Note list comprehension in the next line
plt.xticks(x_axis, [textwrap.fill(label, 10) for label in labels], 
           rotation = 10, fontsize=8, horizontalalignment="center")
plt.tight_layout()           # makes space on the figure canvas for the labels
plt.tick_params(axis="x", pad=6) 

gives

enter image description here

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