easy_install.py 文件源码

def maybe_move(self, spec, dist_filename, setup_base):
        dst = os.path.join(self.build_directory, spec.key)
        if os.path.exists(dst):
            msg = (
                "%r already exists in %s; build directory %s will not be kept"
            )
            log.warn(msg, spec.key, self.build_directory, setup_base)
            return setup_base
        if os.path.isdir(dist_filename):
            setup_base = dist_filename
        else:
            if os.path.dirname(dist_filename) == setup_base:
                os.unlink(dist_filename)  # get it out of the tmp dir
            contents = os.listdir(setup_base)
            if len(contents) == 1:
                dist_filename = os.path.join(setup_base, contents[0])
                if os.path.isdir(dist_filename):
                    # if the only thing there is a directory, move it instead
                    setup_base = dist_filename
        ensure_directory(dst)
        shutil.move(setup_base, dst)
        return dst