BF to GGGGGG

import sys

if len(sys.argv) < 2:
    coderaw = raw_input("No program selected; input code: ")
else:
    try:
        f = open(sys.argv[1], 'r')
    except IOError:
        print "File not found, aborting."
        raw_input()
        exit()
    f_ = True

    coderaw = f.read()

output = ""

for char in coderaw:
    if char == ">":
        output += "G "
    elif char == "<":
        output += "GG "
    elif char == ".":
        output += "GGG "
    elif char == "+":
        output += "GGGG "
    elif char == "-":
        output += "GGGGG "
    elif char == ",":
        output += "GGGGGG "
    elif char == "[":
        output += "GGGGGGG "
    elif char == "]":
        output += "GGGGGGGG "

print output

with open(sys.argv[1], 'w') as stream:
    stream.write(output)

raw_input()