如何使pycharm重新确认系统安装的cython模块？

我在ubuntu 20.04上。我已经为python3安装了lxml。我有一个

test.pyx

cimport lxml：

cimport lxml.includes.etreepublic as cetree
cdef object etree
from lxml import etree

cetree.import_lxml__etree()

---

cimport中不存在lxml的pycharm报告。但是setup.py可以毫无问题地构建它。有谁能告诉我，我还需要什么额外的步骤来确保pycharm识别cython模块？我想让自动完成工作

setup.py：

import subprocess

from setuptools import setup
from Cython.Distutils import build_ext
from Cython.Distutils.extension import Extension
from Cython.Build import cythonize
import lxml

def pkgconfig(package: str, **kwargs):
    flag_map = {'-I': 'include_dirs', '-L': 'library_dirs', '-l': 'libraries'}
    output = subprocess.getoutput(
        'pkg-config --cflags --libs {}'.format(package))
    for token in output.strip().split():
        kwargs.setdefault(flag_map.get(token[:2]), []).append(token[2:])
    return kwargs

ext_modules = cythonize(
    Extension(
        "test",
        sources=["test.pyx"],
        language="c",
        **pkgconfig(
            "libxml-2.0",
            include_dirs=lxml.__path__,
        ),

    ),
    language_level = "3"
)

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“我想让自动完成工作”