Average of a list of numbers, stored as strings in a Python list

Question

I want to calculate the average value of several lists in python. These lists contain numbers as strings. Empty string isn\'t zero, it means a missing value.

The be

Answer 1

In Python 3.4 use the statistics library:

from statistics import mean
num = ['1', '2', '', '6']
ave = mean(int(n) if n else 0 for n in num)