base.py 文件源码

def read_yaml(self):
        docs_gen = yaml.safe_load_all(self.app.stdin)
        doc = next(docs_gen)
        guard = object()
        if next(docs_gen, guard) is not guard:
            self.app.stderr.write("Warning: will use only first "
                                  "document from YAML stream")
        return doc