Quiz: Hangs

#!/usr/bin/python
import sys
import itertools
def square_sum(int_arr):
    out = i = 0
    n = len(int_arr)
    while i < n:
        try:
            out += int_arr[i]
            i = i + 1
        except:
            print("erroroneous data seen, ignoring")
    return out
def main():
    arr = [1,2,3,4,'5']
    print(square_sum(arr))
if __name__ == "__main__":
    main()