我正在嘗試安裝 pyautogui，但 pip 不斷拋出錯誤。如何修復它？我嘗試安裝 libffi 庫。這是一些代碼：python3 -m pip install pyautoguiDefaulting to user installation because normal site-packages is not writeableCollecting pyautogui  Using cached PyAutoGUI-0.9.50.tar.gz (57 kB)    ERROR: Command errored out with exit status 1:     command: /usr/local/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-sxm4ewnq/pyautogui/setup.py'"'"'; __file__='"'"'/tmp/pip-install-sxm4ewnq/pyautogui/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-85ugzov6         cwd: /tmp/pip-install-sxm4ewnq/pyautogui/    Complete output (11 lines):    Traceback (most recent call last):      File "<string>", line 1, in <module>      File "/usr/local/lib/python3.8/site-packages/setuptools/__init__.py", line 19, in <module>        from setuptools.dist import Distribution      File "/usr/local/lib/python3.8/site-packages/setuptools/dist.py", line 34, in <module>        from setuptools import windows_support      File "/usr/local/lib/python3.8/site-packages/setuptools/windows_support.py", line 2, in <module>        import ctypes      File "/usr/local/lib/python3.8/ctypes/__init__.py", line 7, in <module>        from _ctypes import Union, Structure, Array    ModuleNotFoundError: No module named '_ctypes'    ----------------------------------------ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.