Log of the mean of the exp of values from standard input

log_of_mean_exp.py

#!/usr/bin/env python
import sys, math
v_list = [float(value) for value in sys.stdin]
offset = max(v_list)
n = len(v_list)
sum_exps = sum([math.exp(v - offset) for v in v_list])
mean_exps = sum_exps/n
sys.stdout.write('Log of mean of the exp of %d values is:\n' %  n)
sys.stdout.write('%8.7f\n' % (math.log(mean_exps) + offset))