from functools import reduce
from operator import mul
a = [20, 4, 35, 3, 4]
print(reduce(mul, a[a.index(max(a))+1:], 1))
encoder = LabelEncoder()
encoder.fit(X)
numpy.save('classes.npy', encoder.classes_)
encoder = LabelEncoder()
encoder.classes_ = numpy.load('classes.npy')
# Now you should be able to use encoder
# as you would do after `fit`