Python 3 code that implements servo control for gcode produced by LaserWeb4

support.py

#open the file in local memory and make a list containing every line as a new string element
fileobj = open("C:/Users/Name/Downloads/sample.gcode", "r")
contents = fileobj.readlines()
fileobj.close()

#find instances of "G0" and sandwich it between the servo up and down commands
count = 0
index = 0
length = len(contents)
flag = False

while 0 <= index <= length:

    if flag == True: #fixes indexing to avoid infinite loop after sandwich
        index = index + 1
        length = length + 1
        flag = False
    try: #the sandwich function
        if contents[index][0] == 'G' and contents[index][1] == '0':
            count = count + 1 #one more G0 for the books
            contents.insert(index, "M03S75\n")
            contents.insert(index + 2, "M05\n")
            flag = True

    except IndexError:
        pass #if it catches an empty line, just ignore it

    index = index + 1 #pseudo for-loop

#write the new lines to the file
fileobj = open("C:/Users/Name/Downloads/sample.gcode", "w")
fileobj.writelines(contents)
fileobj.close()