dlib python3.9版本

### dlib Library for Python 3.9 Installation and Compatibility For installing the `dlib` library specifically tailored to Python 3.9, one approach involves downloading a pre-built wheel file compatible with this version of Python. The command used after obtaining such a wheel (`dlib-19.23.0-cp39-cp39-win_amd64.whl`) is as follows: ```bash pip install dlib-19.23.0-cp39-cp39-win_amd64.whl ``` This method bypasses potential compilation issues by using binaries already compiled against Python 3.9 on Windows systems[^1]. Another source mentions availability of a slightly different version (`dlib-19.22.99-cp39-cp39-win_amd64.whl`), which can also be considered when looking for versions that support Python 3.9 environments[^2]. To ensure smooth installation without encountering common errors associated with building from source or missing dependencies, it's recommended first to install necessary build tools like Boost and CMake before proceeding with any specific installation steps related to `dlib`. This preparation helps avoid complications during package setup[^3]. When opting to compile directly from sources obtained via http://dlib.net/, navigating through Visual Studio’s developer prompt becomes essential. Changing directories within these prompts (using commands like `cd..` for moving up directory levels or specifying paths) followed by executing `python setup.py install`, allows users to manually handle installations while ensuring compatibility with their development environment settings[^4]. Lastly, an alternative straightforward procedure has been documented where administrators run Command Prompt in elevated mode, navigate into the folder containing downloaded `.whl` files suitable for Python 3.9+, then execute similar pip-based installation instructions until completion messages appear indicating successful deployment[^5].