The Major Element(CodeEval) in Python 3.x

main.py

# coding=utf-8
import sys


def major_element(elements):
    m = dict()

    for e in elements:
        m.setdefault(e, 0)
        m[e] += 1
        if m[e] > len(elements) / 2:
            return e
    return None


def main():
    with open(sys.argv[1], "r") as f:
        for line in f:
            elements = line.rstrip().split(',')
            print(major_element(elements))


if __name__ == "__main__":
    main()