test.py

import struct
import sys


def main():

    print 'file:', sys.argv[1]

    with open(sys.argv[1], 'r') as dat_file:
        print 'count:', struct.unpack('=I', dat_file.read(4))

        for i in xrange(10):
            print struct.unpack('=d', dat_file.read(8))


if __name__ == "__main__":
    if len(sys.argv) < 2:
        sys.exit(-1)

    main()