python读取二进制文件

＃读取二进制文件，并以16进制形式打印
myfile = open('a.out','rb')
mystring = myfile.read(16)
while(mystring):
    mystring = map(ord,mystring)
    for x in mystring:
        print "%x" % x,
    print '\n'
    mystring = myfile.read(16)