FIX avoid side effects from mutable default argument · flatironinstitute/pytorch-finufft@d9a3305

pytorch_finufft/__init__.py:4:8: F401 `sys` imported but unused

pytorch_finufft/__init__.py:7:15: F401 `.functional` imported but unused

pytorch_finufft/_err.py:84:89: E501 Line too long (137 > 88 characters)

pytorch_finufft/_err.py:87:8: E721 Do not compare types, use `isinstance()`

pytorch_finufft/_err.py:173:5: F841 Local variable `dimension` is assigned to but never used

pytorch_finufft/functional.py:149:89: E501 Line too long (103 > 88 characters)

pytorch_finufft/functional.py:314:89: E501 Line too long (103 > 88 characters)

pytorch_finufft/functional.py:548:89: E501 Line too long (107 > 88 characters)

pytorch_finufft/functional.py:611:89: E501 Line too long (103 > 88 characters)

pytorch_finufft/functional.py:637:89: E501 Line too long (103 > 88 characters)

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