sudo pip install PyQt5 WARNING: pip is being invoked by an old script wrapper. This will fail in a future version of pip. Please see https://github.com/pypa/pip/issues/5599 for advice on fixing the underlying issue. To avoid this problem you can invoke Python with '-m pip' instead of running pip directly. No handlers could be found for logger "pip._internal.network.auth" DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality. WARNING: The directory '/home/trunk/.cache/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag. ERROR: Could not find a version that satisfies the requirement PyQt5 (from versions: none) ERROR: No matching distribution found for PyQt5

这个问题可能是因为你的 Python 版本太旧而导致的。建议你升级到 Python 3.x 版本，并使用类似以下的命令安装 PyQt5：

pip3 install PyQt5

如果你使用的是 Anaconda，可以使用以下命令安装：

conda install pyqt

另外，你也可以在命令行中使用 `-m pip` 来运行 pip，例如：

sudo python -m pip install PyQt5

这样可以避免一些潜在的问题。如果还有其他问题，请让我知道。