安装lru时报错详情：

(textattack-master) G:\xxx\TextAttack-master>pip install lru
Collecting lruUsing cached lru-0.1.tar.gz (1.1 kB)Preparing metadata (setup.py) ... errorerror: subprocess-exited-with-error× python setup.py egg_info did not run successfully.│ exit code: 1╰─> [9 lines of output]Traceback (most recent call last):File "<string>", line 36, in <module>File "<pip-setuptools-caller>", line 34, in <module>File "C:\Users\user\AppData\Local\Temp\pip-install-ol85bcqc\lru_2da420766b1d47d693126f3791a2d882\setup.py", line 2, in <module>from lru import __version__ as versionFile "C:\Users\user\AppData\Local\Temp\pip-install-ol85bcqc\lru_2da420766b1d47d693126f3791a2d882\lru.py", line 18raise KeyError, key^SyntaxError: invalid syntax[end of output]note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed× Encountered error while generating package metadata.
╰─> See above for output.note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

TextAttackTextAttack: A Framework for Adversarial Attacks, Data Augmentation, and Adversarial Training in NLP. John Morris, Eli Lifland, Jin Yong Yoo, Jake Grigsby, Di Jin, Yanjun Qi. EMNLP 2020 Demo. [website] [doc] [pdf]