venn_test.py

from matplotlib_venn import venn3
from matplotlib import pyplot as plt
from collections import Counter

set1 = set(['A', 'B', 'C', 'D'])
set2 = set(['B', 'C', 'D', 'E'])
set3 = set(['C', 'D',' E', 'F', 'G'])

union = set1.union(set2).union(set3)

indicators = ['%d%d%d' % (a in set1, a in set2, a in set3) for a in union]

subsets = Counter(indicators)

test = venn3(subsets, ('Set1', 'Set2', 'Set3'))

plt.plot(test)
plt.show()