Lettercase Percentage Ratio (CodeEval) in Python 3.x

main.py

# coding=utf-8
import sys


def main():
    with open(sys.argv[1], "r") as f:
        for line in f:
            lower_count = 0
            upper_count = 0
            for c in line.rstrip():
                if c.islower():
                    lower_count += 1
                else:
                    upper_count += 1

            total_count = float(lower_count + upper_count)
            lower_ratio = round((float(lower_count) / total_count) * 100.0, 2)
            upper_ratio = round((float(upper_count) / total_count) * 100.0, 2)

            print("lowercase: {lower_ratio:2.2f} uppercase: {upper_ratio:2.2f}".format(
                lower_ratio=lower_ratio,
                upper_ratio=upper_ratio))


if __name__ == "__main__":
    main()