class_docstr: Utility class for performing a group by operation over a lazy DataFrame.
  
  Generated by calling `df.lazy().group_by(...)`.
class_docstr_tok: ["Utility","class","for","performing","a","group","by","operation","over","a","lazy","DataFrame",".","Generated","by","calling","`","df.lazy","(",")",".group_by","(","...",")","`","."]
code: def __init__(self, lgb: PyLazyGroupBy) -> None:
      self.lgb = lgb
  
imports: from __future__ import annotations
  from typing import TYPE_CHECKING, Callable, Iterable
  from polars import functions
  from polars.utils._parse_expr_input import parse_as_list_of_expressions
  from polars.utils._wrap import wrap_ldf
  from polars.utils.deprecation import deprecate_renamed_function
label_desc: Use image node_id 1 to create a new LazyGroupBy object  with example: obj = LazyGroupBy(lgb)