What if there is no LongPoll in the vk_api libraries?
As of 02/03/2021, the developers of the vk_api module for Python apparently simply forgot to add the long poll import or accidentally deleted it.
To fix the developer error:
Open the folder with the module
Add the code below to the file "__init__.py"
from .longpoll import VkLongPoll
Or just download the already edited "__init__.py " file and replace the old one with the new one.