annotations导入报错 - 不止于python

相关环境版本

1
2
3

python 3.7.10
fastapi 0.63.0
Cython 0.29.22

报错文件

# main.py
from __future__ import annotations
......
# code

报错信息

main.py:1:23: future feature annotations is not defined
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/dist-packages/Cython/Build/Dependencies.py", line 1249, in cythonize_one_helper
    return cythonize_one(*m)
  File "/usr/local/lib/python3.7/dist-packages/Cython/Build/Dependencies.py", line 1225, in cythonize_one
    raise CompileError(None, pyx_file)

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