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The forest functional level can be changed by right-clicking Active Directory Domains and Trusts and selecting Raise Forest Functional Level… Before doing this step, you must ensure that all domains in the forest are at the level required for the change. If your domain provider is listed in the verification wizard.
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The domain functional level can be changed by right-clicking the domain and selecting Raise Domain Functional Level… Before doing this step, you must ensure that all domain controllers are running the version(s) of windows that allow for the change. For more information on raising domain and forest functional levels, visit the Microsoft page – How to raise Active Directory domain and forest functional levels. To find the Forest Functional Level, use this command: To find the Domain Functional Level, use this command:

The most common module to execute these commands in Python is subprocess.

This check can also be done using the nslookup or dig commands.
