EsotericAlgorithm

directories = ['azw3', 'epub', 'mobi']
conversion_space = "convert"
sink = open('/dev/null', 'w')

def convert_book(input, output):
    subprocess.call("ebook-convert" + " " + input  + " " + output, shell=True, stdout=sink, stderr=sink)

for directory in directories:
    conversion_directory = os.path.join(directory, conversion_space) 
    if not os.path.exists(conversion_directory):