hooks.py 文件源码

def _has_cython(self):
        extensions = self.distribution.ext_modules
        if not USE_CYTHON or not any(_.endswith('.pyx')
                                     for ext in extensions
                                     for _ in ext.sources):
            return False
        try:
            import Cython
        except ImportError:
            print('Cython is not installed, defaulting to C/C++ files.')
            return False
        if parse_version(Cython.__version__) < \
           parse_version(MIN_VERSION_CYTHON):
            print("The Cython version is older than that required ('{0}' < '{1"
                  "}'). Defaulting to C/C++ files."
                  .format(Cython.__version__, MIN_VERSION_CYTHON))
            return False
        return True