class_docstr: Namespace for string related expressions.
class_docstr_tok: ["Namespace","for","string","related","expressions","."]
docstr: Remove leading characters.
  
  .. note::
      This method strips any characters present in `characters` from the
      start of the input, no matter their order. To strip a prefix (i.e.
      a "word" of characters in a certain order), use
      :func:`strip_prefix` instead.
  
  Parameters
  ----------
  characters
      The set of characters to be removed. All combinations of this set of
      characters will be stripped. If set to None (default), all whitespace is
      removed instead.
  
  See Also
  --------
  strip_prefix
  strip_chars_end
  
  Examples
  --------
  >>> df = pl.DataFrame({"foo": [" hello ", "\tworld"]})
  >>> df.with_columns(foo_strip_start=pl.col("foo").str.strip_chars_start())
  shape: (2, 2)
  ┌─────────┬─────────────────┐
  │ foo     ┆ foo_strip_start │
  │ ---     ┆ ---             │
  │ str     ┆ str             │
  ╞═════════╪═════════════════╡
  │  hello  ┆ hello           │
  │   world   ┆ world           │
  └─────────┴─────────────────┘
  
  Characters can be stripped by passing a string as argument. Note that whitespace
  will not be stripped automatically when doing so.
  
  >>> df.with_columns(
  ...     foo_strip_start=pl.col("foo").str.strip_chars_start("wod\t"),
  ... )
  shape: (2, 2)
  ┌─────────┬─────────────────┐
  │ foo     ┆ foo_strip_start │
  │ ---     ┆ ---             │
  │ str     ┆ str             │
  ╞═════════╪═════════════════╡
  │  hello  ┆  hello          │
  │   world   ┆ rld             │
  └─────────┴─────────────────┘
  
  The order of the provided characters does not matter, they behave like a set.
  
  >>> pl.DataFrame({"foo": ["aabcdef"]}).with_columns(
  ...     foo_strip_start=pl.col("foo").str.strip_chars_start("cba")
  ... )
  shape: (1, 2)
  ┌─────────┬─────────────────┐
  │ foo     ┆ foo_strip_start │
  │ ---     ┆ ---             │
  │ str     ┆ str             │
  ╞═════════╪═════════════════╡
  │ aabcdef ┆ def             │
  └─────────┴─────────────────┘
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code: def strip_chars_start(
      self, characters: IntoExprColumn | None = None
  ) -> Expr:
      r"""
      Remove leading characters.
  
      .. note::
          This method strips any characters present in `characters` from the
          start of the input, no matter their order. To strip a prefix (i.e.
          a "word" of characters in a certain order), use
          :func:`strip_prefix` instead.
  
      Parameters
      ----------
      characters
          The set of characters to be removed. All combinations of this set of
          characters will be stripped. If set to None (default), all whitespace is
          removed instead.
  
      See Also
      --------
      strip_prefix
      strip_chars_end
  
      Examples
      --------
      >>> df = pl.DataFrame({"foo": [" hello ", "\tworld"]})
      >>> df.with_columns(foo_strip_start=pl.col("foo").str.strip_chars_start())
      shape: (2, 2)
      ┌─────────┬─────────────────┐
      │ foo     ┆ foo_strip_start │
      │ ---     ┆ ---             │
      │ str     ┆ str             │
      ╞═════════╪═════════════════╡
      │  hello  ┆ hello           │
      │   world   ┆ world           │
      └─────────┴─────────────────┘
  
      Characters can be stripped by passing a string as argument. Note that whitespace
      will not be stripped automatically when doing so.
  
      >>> df.with_columns(
      ...     foo_strip_start=pl.col("foo").str.strip_chars_start("wod\t"),
      ... )
      shape: (2, 2)
      ┌─────────┬─────────────────┐
      │ foo     ┆ foo_strip_start │
      │ ---     ┆ ---             │
      │ str     ┆ str             │
      ╞═════════╪═════════════════╡
      │  hello  ┆  hello          │
      │   world   ┆ rld             │
      └─────────┴─────────────────┘
  
      The order of the provided characters does not matter, they behave like a set.
  
      >>> pl.DataFrame({"foo": ["aabcdef"]}).with_columns(
      ...     foo_strip_start=pl.col("foo").str.strip_chars_start("cba")
      ... )
      shape: (1, 2)
      ┌─────────┬─────────────────┐
      │ foo     ┆ foo_strip_start │
      │ ---     ┆ ---             │
      │ str     ┆ str             │
      ╞═════════╪═════════════════╡
      │ aabcdef ┆ def             │
      └─────────┴─────────────────┘
  
      """
      characters = parse_as_expression(characters, str_as_lit=True)
      return wrap_expr(self._pyexpr.str_strip_chars_start(characters))
  
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 14 for calling the ExprStringNameSpace obj's underlying member method code with example usage: obj.strip_chars_start(characters) and returns: wrap_expr