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 "/in/foo.py", line 12
    result_str = f"{result:.900f}"  # \u4fdd\u7559\u5c0f\u6570\u70b9\u540e 900 \u4f4d\uff0c\u907f\u514d\u79d1\u5b66\u8ba1\u6570\u6cd5
                                 ^
SyntaxError: invalid syntax

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 "/in/foo.py", line 12
    result_str = f"{result:.900f}"  # \u4fdd\u7559\u5c0f\u6570\u70b9\u540e 900 \u4f4d\uff0c\u907f\u514d\u79d1\u5b66\u8ba1\u6570\u6cd5
                                 ^
SyntaxError: invalid syntax