Traceback (most recent call last):


 "/usr/local/bin/aws", line 27, in <module>

sys.exit(main())


 "/usr/local/bin/aws", line 23, in main

return awscli.clidriver.main()


 "/usr/local/lib/python2.7/dist-packages/awscli/clidriver.py", line 58, in main

driver = create_clidriver()


 "/usr/local/lib/python2.7/dist-packages/awscli/clidriver.py", line 69, in create_clidriver

event_hooks=emitter)


 "/usr/local/lib/python2.7/dist-packages/awscli/plugin.py", line 45, in load_plugins

modules = _import_plugins(plugin_mapping)


 "/usr/local/lib/python2.7/dist-packages/awscli/plugin.py", line 62, in _import_plugins

module = __import__(path, fromlist=[module])


 "/usr/local/lib/python2.7/dist-packages/awscli/handlers.py", line 27, in <module>

from awscli.customizations.cloudformation import initialize as cloudformation_init


 "/usr/local/lib/python2.7/dist-packages/awscli/customizations/cloudformation/__init__.py", line 13, in <module>

from awscli.customizations.cloudformation.package import PackageCommand


 "/usr/local/lib/python2.7/dist-packages/awscli/customizations/cloudformation/package.py", line 26, in <module>

from awscli.customizations.s3uploader import S3Uploader


 "/usr/local/lib/python2.7/dist-packages/awscli/customizations/s3uploader.py", line 22, in <module>

from s3transfer.manager import TransferManager


 "/usr/local/lib/python2.7/dist-packages/s3transfer/__init__.py", line 134, in <module>

import concurrent.futures
ImportError: No module named concurrent.futures

Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 "optuna/__init__.py", line 11, in init optuna.__init__


 "optuna/importance/__init__.py", line 5, in init optuna.importance.__init__


 "optuna/importance/_base.py", line 12, in init optuna.importance._base


 "optuna/samplers/__init__.py", line 5, in init optuna.samplers.__init__


 "optuna/samplers/_search_space.py", line 8, in init optuna.samplers._search_space


 "optuna/study.py", line 30, in init optuna.study
ImportError: cannot import name samplers
