refer to: https://matplotlib.org/3.2.2/gallery/ticks_and_spines/tick_labels_from_values.html#sphx-glr-gallery-ticks-and-spines-tick-labels-from-values-py

import matplotlib.pyplot as pltfrom matplotlib.ticker import FuncFormatter, MaxNLocatorfig, ax = plt.subplots()xs = range(26)ys = range(26)labels = list('abcdefghijklmnopqrstuvwxyz')def format_fn(tick_val, tick_pos):
   if int(tick_val) in xs:
       return labels[int(tick_val)]
   else:
       return ''ax.xaxis.set_major_formatter(FuncFormatter(format_fn))ax.xaxis.set_major_locator(MaxNLocator(integer=True))ax.plot(xs, ys)plt.show()




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