How to add a screenshot to allure report with python?

For allure 2

from allure_commons.types import AttachmentType

allure.attach(driver.get_screenshot_as_png(), name="Screenshot", attachment_type=AttachmentType.PNG)

Instead of setting the type as a string png, you need to use allure module attachment type constant, which is an Enum with extension attribute defined:

from allure.constants import AttachmentType

allure.attach('screenshot', driver.get_screenshot_as_png(), type=AttachmentType.PNG)