plot_word_length_in_letters.py

from num2words import num2words
from matplotlib import pyplot

lang = 'de'
words = [num2words(i, lang=lang) for i in range(1000000)]
fig = pyplot.figure()
ax = fig.add_subplot(111)

ax.semilogx([len(word) for word in words], color='green')

for p in range(1, 6):
    lo, hi = 10**p, 10**(p+1)
    if hi > len(words):
         break
    x_max = max(range(lo, hi), key=lambda x: len(words[x]))
    kwargs = dict(horizontalalignment='right', arrowprops=dict(shrink=0.05, width=2.0, headwidth=5.0, headlength=2.0, facecolor='black'))
    ax.annotate('%d: "%s" (%d)' % (len(words[x_max]), words[x_max], x_max), xy=(x_max, len(words[x_max])), xytext=(x_max, len(words[x_max])+10), **kwargs)

pyplot.xlim([0, len(words)])
pyplot.ylim([0, 100])
pyplot.title('Number of letters of the German word for each number')
pyplot.tight_layout()
pyplot.show()