build_ext.py 文件源码

def write_stub(self, output_dir, ext, compile=False):
        log.info("writing stub loader for %s to %s",ext._full_name, output_dir)
        stub_file = os.path.join(output_dir, *ext._full_name.split('.'))+'.py'
        if compile and os.path.exists(stub_file):
            raise DistutilsError(stub_file+" already exists! Please delete.")
        if not self.dry_run:
            f = open(stub_file,'w')
            f.write('\n'.join([
                "def __bootstrap__():",
                "   global __bootstrap__, __file__, __loader__",
                "   import sys, os, pkg_resources, imp"+if_dl(", dl"),
                "   __file__ = pkg_resources.resource_filename(__name__,%r)"
                   % os.path.basename(ext._file_name),
                "   del __bootstrap__",
                "   if '__loader__' in globals():",
                "       del __loader__",
                if_dl("   old_flags = sys.getdlopenflags()"),
                "   old_dir = os.getcwd()",
                "   try:",
                "     os.chdir(os.path.dirname(__file__))",
                if_dl("     sys.setdlopenflags(dl.RTLD_NOW)"),
                "     imp.load_dynamic(__name__,__file__)",
                "   finally:",
                if_dl("     sys.setdlopenflags(old_flags)"),
                "     os.chdir(old_dir)",
                "__bootstrap__()",
                "" # terminal \n
            ]))
            f.close()
        if compile:
            from distutils.util import byte_compile
            byte_compile([stub_file], optimize=0,
                         force=True, dry_run=self.dry_run)
            optimize = self.get_finalized_command('install_lib').optimize
            if optimize > 0:
                byte_compile([stub_file], optimize=optimize,
                             force=True, dry_run=self.dry_run)
            if os.path.exists(stub_file) and not self.dry_run:
                os.unlink(stub_file)