transpose a BSR matrix

transpose_matrix.py

#!/usr/bin/env python

import sys
from sys import argv

try:
    out_matrix = open("transposed_matrix.matrix", "w")
    reduced = []
    with open(argv[1]) as my_file:
        for line in my_file:
            newline=line.strip("\n")
            fields = newline.split("\t")
            reduced.append(fields)
    test=map(list, zip(*reduced))
    for x in test:
        out_matrix.write("\t".join(x)+"\n")
    out_matrix.close()
except:
    print("usage: script bsr_matrix.txt")
    sys.exit()