class_docstr: Namespace for string related expressions.
class_docstr_tok: ["Namespace","for","string","related","expressions","."]
docstr: Transform to uppercase variant.
  
  Examples
  --------
  >>> df = pl.DataFrame({"foo": ["cat", "dog"]})
  >>> df.with_columns(foo_upper=pl.col("foo").str.to_uppercase())
  shape: (2, 2)
  ┌─────┬───────────┐
  │ foo ┆ foo_upper │
  │ --- ┆ ---       │
  │ str ┆ str       │
  ╞═════╪═══════════╡
  │ cat ┆ CAT       │
  │ dog ┆ DOG       │
  └─────┴───────────┘
docstr_tok: ["Transform","to","uppercase","variant",".","Examples","--","--","--","--",">",">",">","df","=","pl.DataFrame","(","{","``","foo","''",":","[","``","cat","''",",","``","dog","''","]","}",")",">",">",">","df.with_columns","(","foo_upper=pl.col","(","``","foo","''",")",".str.to_uppercase","(",")",")","shape",":","(","2",",","2",")","\u250c\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510","\u2502","foo","\u2506","foo_upper","\u2502","\u2502","--","-","\u2506","--","-","\u2502","\u2502","str","\u2506","str","\u2502","\u255e\u2550\u2550\u2550\u2550\u2550\u256a\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2561","\u2502","cat","\u2506","CAT","\u2502","\u2502","dog","\u2506","DOG","\u2502","\u2514\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518"]
code: def to_uppercase(self) -> Expr:
      """
      Transform to uppercase variant.
  
      Examples
      --------
      >>> df = pl.DataFrame({"foo": ["cat", "dog"]})
      >>> df.with_columns(foo_upper=pl.col("foo").str.to_uppercase())
      shape: (2, 2)
      ┌─────┬───────────┐
      │ foo ┆ foo_upper │
      │ --- ┆ ---       │
      │ str ┆ str       │
      ╞═════╪═══════════╡
      │ cat ┆ CAT       │
      │ dog ┆ DOG       │
      └─────┴───────────┘
  
      """
      return wrap_expr(self._pyexpr.str_to_uppercase())
  
imports: from __future__ import annotations
  import warnings
  from typing import TYPE_CHECKING
  import polars._reexport
  from polars import functions
  from polars.datatypes import Date, Datetime, Int32, Time, py_type_to_dtype
  from polars.exceptions import ChronoFormatWarning
  from polars.utils._parse_expr_input import parse_as_expression
  from polars.utils._wrap import wrap_expr
  from polars.utils.deprecation import deprecate_renamed_function, deprecate_renamed_parameter, rename_use_earliest_to_ambiguous
  from polars.utils.various import find_stacklevel
label_desc: Use image node_id 10 for calling the ExprStringNameSpace obj's underlying member method code with example usage: obj.to_uppercase() and returns: wrap_expr