lint: MYPY_CACHE_DIR is unused #28183

1. 
   MarcoFalke commented at 8:37 am on July 30, 2023: member

   See also the discussion in https://github.com/bitcoin/bitcoin/pull/24794/files#r844848504 . However, the variable is completely unused:

   0$ git grep MYPY_CACHE_DIR
   1test/lint/lint-python.py:MYPY_CACHE_DIR = f"{os.getenv('BASE_ROOT_DIR', '')}/test/.mypy_cache"
   

   Not sure if it was ever needed. If not, it should be removed. cc @fjahr

2. MarcoFalke added the label Tests on Jul 30, 2023
3. 
   MarcoFalke commented at 2:29 pm on August 17, 2023: member

   Let’s move discussion to https://github.com/bitcoin/bitcoin/pull/28184
4. MarcoFalke closed this on Aug 17, 2023

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