* Remove additional ignores from flake8
* Remove all unused imports
* Remove all unused imports
* Update flake8 and pyupgrade
* F841, removed unused variables
* E731, removed lambda assignment to variables
* Remove E731, F403, F405, F524
* Remove E722, bare exceptions
* Remove E712, compare variable == True or == False to is True or is False
* Remove E402, module level import not at top of file
* Added --pre-file-ignores
* Add --per-file-ignores removing E741, E302 and E704
* Add E741, do not use variables named ‘l’, ‘O’, or ‘I’ to ignore issues in classic control
* Fixed issues for pytest==6.2
* Remove unnecessary # noqa
* Edit comment with the removal of E302
* Added warnings and declared module, attr for pyright type hinting
* Remove unused import
* Removed flake8 E302
* Updated flake8 from 3.9.2 to 4.0.1
* Remove unused variable
* Fixed ordering of space. Added singledispatch utility.
* Added singledispatch utility to vector.utils & changed order of space argument
* Fixed Error from _BaseGymSpaces
* Minor adjustment for Discrete Spaces
* Fixed Tests/ to reflect changes
* Fixed precommit error - custom namespaces
* Concrete Implementations start with _
* Allow custom observation spaces in VectorEnv
* Replace np.copy by deepcopy in reset of SyncVectorEnv
* Add tests for VectorEnv with custom spaces
* Add tests for shared memory and batches of custom spaces
* Remove unused import in VectorEnv test
* Add warning note in the Space class for custom spaces
* Initial version of vectorized environments
* Raise an exception in the main process if child process raises an exception
* Add list of exposed functions in vector module
* Use deepcopy instead of np.copy
* Add documentation for vector utils
* Add tests for copy in AsyncVectorEnv
* Add example in documentation for batch_space
* Add cloudpickle dependency in setup.py
* Fix __del__ in VectorEnv
* Check if all observation spaces are equal in AsyncVectorEnv
* Check if all observation spaces are equal in SyncVectorEnv
* Fix spaces non equality in SyncVectorEnv for Python 2
* Handle None parameter in create_empty_array
* Fix check_observation_space with spaces equality
* Raise an exception when operations are out of order in AsyncVectorEnv
* Add version requirement for cloudpickle
* Use a state instead of binary flags in AsyncVectorEnv
* Use numpy.zeros when initializing observations in vectorized environments
* Remove poll from public API in AsyncVectorEnv
* Remove close_extras from VectorEnv
* Add test between AsyncVectorEnv and SyncVectorEnv
* Remove close in check_observation_space
* Add documentation for seed and close
* Refactor exceptions for AsyncVectorEnv
* Close pipes if the environment raises an error
* Add tests for out of order operations
* Change default argument in create_empty_array to np.zeros
* Add get_attr and set_attr methods to VectorEnv
* Improve consistency in SyncVectorEnv
