simple file viewer in hex format. usage: hexview.py <filename>

hexview.py

#!/usr/bin/python3
'''
HexView.Py - A simple File Viewer in Hexadecimal format.
Author: FarooqKZ
Under GPL3+. THIS SOFTWARE COMES WITH NO WARRENTY FROM MAIN AUTHOR.
'''

import sys  # I inlcude this to use sys.exit() and sys.argv


def showhelp():  # this function shows usage of program
    print("Usage: hexview.py file_path\n\tfile_path: Path of file to view.")
    sys.exit()

if '-h' in sys.argv:  
    # shows help if something like this passed to program: 'hexview.py -h'
    showhelp()

path = sys.argv[1]
filestream = None
fbytes = None

try:
    filestream = open(path, 'br')
    fbytes = filestream.read()  # Read all bytes from the file 
finally:
    if filestream:
        filestream.close()

rown = 0 
print('')
for b in fbytes:
    s = hex(b).upper()
    s = s.replace('0X', '')  # "0XBA" => "BA"

    if len(s) == 1: 
        print('0', end='')
    print(s, end=' ')

    rown += 1
    if (rown % 27) == 0:
        print('')

print("\n")  # prints 2 newline