class_docstr: Namespace for expressions on a meta level.
class_docstr_tok: ["Namespace","for","expressions","on","a","meta","level","."]
code: def write_json(self, file: None = ...) -> str:
      ...
  
imports: from __future__ import annotations
  from io import BytesIO, StringIO
  from pathlib import Path
  from typing import TYPE_CHECKING, Literal, overload
  from polars.exceptions import ComputeError
  from polars.utils._wrap import wrap_expr
  from polars.utils.deprecation import deprecate_nonkeyword_arguments
  from polars.utils.various import normalize_filepath
label_desc: Use image node_id 19 for calling the ExprMetaNameSpace obj's underlying member method code with example usage: obj.write_json(file) without return types