potiuk commented on issue #9789:
URL: https://github.com/apache/airflow/issues/9789#issuecomment-657590804
It'sexpected. Why do you want to use mypy in 2.7 in Airflow?
MyPy is purely a development dependency and it's not installed with Airflow
when you install it without [devel] extra. Python 2.7 is already past the end
of life and many tools like MyPy will not work with it any more. In fact MyPy
is clear about it in their documentation
https://github.com/python/mypy/blob/v0.3.1/README.md#requirements
> You need Python 3.2 or later to run mypy
Airflow 1.10 supports Python 2.7, 3.5, 3.6. 3.7 (see
https://github.com/apache/airflow/blob/master/README.md#requirements) so Python
3.5 + requirement is expected.
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