index method

filename = 'test.txt'
delimiter = '"'

# opening file for read
with open(filename) as fileobject:
    # read once, forget about memory insufficiency for sake of I\O
    filedata = fileobject.read()

    quote_positions = [] # tuples of quote indices
    QUOTESTART = None # explicit init
    for index, letter in enumerate(filedata):
        if letter == delimiter:
            if QUOTESTART:
                QUOTEEND = index
                quote_positions.append((QUOTESTART, QUOTEEND))
                QUOTESTART = None
            else:
                QUOTESTART = index + 1 # we dont need delimiter itself

    for position in quote_positions:
        START = position[0]
        END = position[1]
        quote = filedata[START:END]
        print(quote)