wheel.py 文件源码

def _install_build_reqs(self, reqs, prefix):
        # Local import to avoid circular import (wheel <-> req_install)
        from pip._internal.req.req_install import InstallRequirement
        from pip._internal.index import FormatControl
        # Ignore the --no-binary option when installing the build system, so
        # we don't recurse trying to build a self-hosting build system.
        finder = copy.copy(self.finder)
        finder.format_control = FormatControl(set(), set())
        urls = [finder.find_requirement(InstallRequirement.from_line(r),
                                        upgrade=False).url
                for r in reqs]

        args = [sys.executable, '-m', 'pip', 'install', '--ignore-installed',
                '--prefix', prefix] + list(urls)
        with open_spinner("Installing build dependencies") as spinner:
            call_subprocess(args, show_stdout=False, spinner=spinner)