Juglling with zeros (CodeEval) in Python 3.x

main.py

# coding=utf-8
import sys
 
 
def convert1(s):
    elements = s.split(" ")
    b = []
    for flag, seq in zip(*[iter(elements)] * 2):
 
        if flag == "0":
            b.append(seq)
        elif flag == "00":
            for _ in list(seq):
                b.append("1")
    return "".join(b)
 
 
def convert2(s):
    d = 0
    for i, b in enumerate(list(s)):
        if b == '1':
            d += 2 ** (len(s) - i - 1)
    return d
 
 
def main():
    with open(sys.argv[1], "r") as f:
        for line in f:
            print(convert2(convert1(line.rstrip())))


if __name__ == "__main__":
    main()