运行语句时
from __future__ import annotations
我得到以下错误:
Traceback (most recent call last):
File "/usr/lib/python3.5/py_compile.py", line 125, in compile
_optimize=optimize)
File "<frozen importlib._bootstrap_external>", line 735, in source_to_code
File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
File "./prog.py", line 1
from __future__ import annotations
^
SyntaxError: future feature annotations is not defined
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python3.5/py_compile.py", line 129, in compile
raise py_exc
py_compile.PyCompileError: File "./prog.py", line 1
from __future__ import annotations
^
SyntaxError: future feature annotations is not defined
这个错误的原因可能是什么?
看一下您的错误回溯,看起来您正在使用
python 3.5
。是这样吗?如果是这样,则会发生错误,因为根据PEP-563,可以从
Python 3.7
开始导入__future__
annotations
。我没有发现任何提示,这将被移植到以前的版本,但我可能已经错过了。
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