easy_install.py 文件源码

def save(self):
        """Write changed .pth file back to disk"""
        if not self.dirty:
            return

        rel_paths = list(map(self.make_relative, self.paths))
        if rel_paths:
            log.debug("Saving %s", self.filename)
            lines = self._wrap_lines(rel_paths)
            data = '\n'.join(lines) + '\n'

            if os.path.islink(self.filename):
                os.unlink(self.filename)
            with open(self.filename, 'wt') as f:
                f.write(data)

        elif os.path.exists(self.filename):
            log.debug("Deleting empty %s", self.filename)
            os.unlink(self.filename)

        self.dirty = False