There is no legitimate reason to place import statements anywhere other than the very top of Python files. Circular dependencies are a de-facto code smell indicating that your code needs refactoring.
Here is a design pattern for working around difficult dependencies:
https://refactoring.guru/design-patterns/mediator
Here is the corresponding Python example:
https://refactoring.guru/design-patterns/mediator/python/example
The only semi-convincing argument I've seen for placing import statements anywhere other than the top of a Python file would be to place an import inside of a function to squeeze out a tiny amount of performance in case some specific function were rarely called, but unless it's absolutely needed I would never recommend it.