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)