print(seller)
print()
command = input("Choose command №: ")
if command == "stop":
break
elif command == "1":
print("(best products)", "\n")
print("Categories:\n")
for category in categories:
print(category)
print('\n')
ctgr = input("Choose category from given list:")
for prod in seller.get_best_products(ctgr):
print(prod)
elif command == "2":
print("(demand)", "\n")
pprint(seller.find_demand())
elif command == "3":
print("(trend)", "\n")
for product in seller.get_trend():
print(product)
elif command == "4":
print("(sellers)", "\n")
print("Categories:\n")
for category in categories:
