class_docstr: Namespace for datetime related expressions.
docstr: Extract the total days from a Duration type.
  
  Returns
  -------
  Expr
      Expression of data type :class:`Int64`.
  
  Examples
  --------
  >>> from datetime import datetime
  >>> df = pl.DataFrame(
  ...     {
  ...         "date": pl.datetime_range(
  ...             datetime(2020, 3, 1), datetime(2020, 5, 1), "1mo", eager=True
  ...         ),
  ...     }
  ... )
  >>> df.select(
  ...     [
  ...         pl.col("date"),
  ...         pl.col("date").diff().dt.total_days().alias("days_diff"),
  ...     ]
  ... )
  shape: (3, 2)
  ┌─────────────────────┬───────────┐
  │ date                ┆ days_diff │
  │ ---                 ┆ ---       │
  │ datetime[μs]        ┆ i64       │
  ╞═════════════════════╪═══════════╡
  │ 2020-03-01 00:00:00 ┆ null      │
  │ 2020-04-01 00:00:00 ┆ 31        │
  │ 2020-05-01 00:00:00 ┆ 30        │
  └─────────────────────┴───────────┘
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code: def total_days(self) -> Expr:
      """
      Extract the total days from a Duration type.
  
      Returns
      -------
      Expr
          Expression of data type :class:`Int64`.
  
      Examples
      --------
      >>> from datetime import datetime
      >>> df = pl.DataFrame(
      ...     {
      ...         "date": pl.datetime_range(
      ...             datetime(2020, 3, 1), datetime(2020, 5, 1), "1mo", eager=True
      ...         ),
      ...     }
      ... )
      >>> df.select(
      ...     [
      ...         pl.col("date"),
      ...         pl.col("date").diff().dt.total_days().alias("days_diff"),
      ...     ]
      ... )
      shape: (3, 2)
      ┌─────────────────────┬───────────┐
      │ date                ┆ days_diff │
      │ ---                 ┆ ---       │
      │ datetime[μs]        ┆ i64       │
      ╞═════════════════════╪═══════════╡
      │ 2020-03-01 00:00:00 ┆ null      │
      │ 2020-04-01 00:00:00 ┆ 31        │
      │ 2020-05-01 00:00:00 ┆ 30        │
      └─────────────────────┴───────────┘
  
      """
      return wrap_expr(self._pyexpr.dt_total_days())
  
imports: from __future__ import annotations
  import datetime
  from typing import TYPE_CHECKING
  import polars._reexport
  from polars import functions
  from polars.datatypes import DTYPE_TEMPORAL_UNITS, Date, Int32
  from polars.utils._parse_expr_input import parse_as_expression
  from polars.utils._wrap import wrap_expr
  from polars.utils.convert import _timedelta_to_pl_duration
  from polars.utils.deprecation import deprecate_renamed_function, deprecate_saturating, issue_deprecation_warning, rename_use_earliest_to_ambiguous
label_desc: Use image node_id 31 for calling the ExprDateTimeNameSpace obj's underlying member method code with example usage: obj.total_days() and returns: wrap_expr