def main():
"""Method to launch the app."""
content = DataMgt()
if not content.is_database_empty(): # check content of table Product
api = Api()
api.load_data() # if yes, launch api request
liste = Parser(api.api_result) # parse api result
liste.clean() # clean api result
data = Upload(liste.products_list)
data.load_category() # upload table categories content
data.load_products() # upload table products content
session = App()
session.start() # launch the client app
