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Examples: >>> import polars as pl >>> import narwhals as nw >>> df_native = pl.DataFrame({"a": [1, 2, 3]}) >>> df = nw.from_native(df_native) >>> df.implementation.is_cudf() False )rrrs ris_cudfzImplementation.is_cudf~****rc&|tjuS)a6Return whether implementation is Modin. Examples: >>> import polars as pl >>> import narwhals as nw >>> df_native = pl.DataFrame({"a": [1, 2, 3]}) >>> df = nw.from_native(df_native) >>> df.implementation.is_modin() False )rrrs ris_modinzImplementation.is_modins~++++rc&|tjuS)a:Return whether implementation is PySpark. Examples: >>> import polars as pl >>> import narwhals as nw >>> df_native = pl.DataFrame({"a": [1, 2, 3]}) >>> df = nw.from_native(df_native) >>> df.implementation.is_pyspark() False )rrrs r is_pysparkzImplementation.is_pyspark~----rc&|tjuS)aBReturn whether implementation is PySpark. Examples: >>> import polars as pl >>> import narwhals as nw >>> df_native = pl.DataFrame({"a": [1, 2, 3]}) >>> df = nw.from_native(df_native) >>> df.implementation.is_pyspark_connect() False )rrrs ris_pyspark_connectz!Implementation.is_pyspark_connects~5555rc&|tjuS)a:Return whether implementation is PyArrow. Examples: >>> import polars as pl >>> import narwhals as nw >>> df_native = pl.DataFrame({"a": [1, 2, 3]}) >>> df = nw.from_native(df_native) >>> df.implementation.is_pyarrow() False )rrrs r is_pyarrowzImplementation.is_pyarrow r=rc&|tjuS)a4Return whether implementation is Dask. Examples: >>> import polars as pl >>> import narwhals as nw >>> df_native = pl.DataFrame({"a": [1, 2, 3]}) >>> df = nw.from_native(df_native) >>> df.implementation.is_dask() False )rrrs ris_daskzImplementation.is_daskr8rc&|tjuS)a8Return whether implementation is DuckDB. Examples: >>> import polars as pl >>> import narwhals as nw >>> df_native = pl.DataFrame({"a": [1, 2, 3]}) >>> df = nw.from_native(df_native) >>> df.implementation.is_duckdb() False )rrrs r is_duckdbzImplementation.is_duckdb'r/rc&|tjuS)a4Return whether implementation is Ibis. Examples: >>> import polars as pl >>> import narwhals as nw >>> df_native = pl.DataFrame({"a": [1, 2, 3]}) >>> df = nw.from_native(df_native) >>> df.implementation.is_ibis() False )rrrs ris_ibiszImplementation.is_ibis4r8rc&|tjuS)a<Return whether implementation is SQLFrame. Examples: >>> import polars as pl >>> import narwhals as nw >>> df_native = pl.DataFrame({"a": [1, 2, 3]}) >>> df = nw.from_native(df_native) >>> df.implementation.is_sqlframe() False )rrrs r is_sqlframezImplementation.is_sqlframeAs~....rct|S)zReturns backend version.backend_versionrs rrzImplementation._backend_versionNs t$$rNrr)r type[Self]rr=rr)rrNr rrr)rrNr$z)IntoBackend[Backend] | UnknownBackendNamerr)rr=)rboolr)$rrrrr rrrrrrrrrrrr  classmethodrr!r%r,r.r1r3r5r7r:r<r?rArCrErGrIrrrrrrCs'I F E DG!G! 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Hint: Perhaps you - forgot a `nw.from_native` somewhere? - used `pl.col` instead of `nw.col`?) rrtr+r#ror,Exprrpqualified_type_name TypeErrorrrbytes)rsrtpdplr*s rrnrns&| (Zbii=V-W| ( sRYYr||L M77J37O6RS3 3 n c8 $ RZc5&=Q-R)RRrc"t|tSr)r#r)vals r is_iteratorr~s c8 $$rct|tr|n |j}tjdd|}t d|j dDS)zSimple version parser; split into a tuple of ints for comparison. 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Arguments: lhs: Dataframe or Series. rhs: Dataframe or Series to align with. Notes: This is only really intended for backwards-compatibility purposes, for example if your library already aligns indices for users. If you're designing a new library, we highly encourage you to not rely on the Index. For non-pandas-like inputs, this only checks that `lhs` and `rhs` are the same length. Examples: >>> import pandas as pd >>> import polars as pl >>> import narwhals as nw >>> df_pd = pd.DataFrame({"a": [1, 2]}, index=[3, 4]) >>> s_pd = pd.Series([6, 7], index=[4, 3]) >>> df = nw.from_native(df_pd) >>> s = nw.from_native(s_pd, series_only=True) >>> nw.to_native(nw.maybe_align_index(df, s)) a 4 2 3 1 r)PandasLikeDataFrame)PandasLikeSeriesrc6|js d}t|y)Nz'given index doesn't have a unique index) is_uniquer)indexr*s r_validate_indexz*maybe_align_index.._validate_index$s;CS/ !r_compliant_frameN_compliant_seriesz6Expected `lhs` and `rhs` to have the same length, got z and )rrrr)narwhals._pandas_like.dataframernarwhals._pandas_like.seriesrr r#getattrrrr_with_compliant _with_nativelocrrmr)lhsrhsrrrlhs_anyrhs_anyr*s rmaybe_align_indexrsI<D=" 5#G5#G+T24G WW&8$?AT U0077==>0077==>&&  $ $ 1 1((//33G4L4L4S4S4Y4YZ   +T24G WW&94@BR S0077==>1188>>?&&  $ $ 1 1((//33--44::   ,d35E WW&8$?AT U1188>>?0077==>&&  % % 2 2))0044,,3399   ,d35E WW&94@BR S1188>>?1188>>?&&  % % 2 2))0044--44::    7|s7|#Fs7|nTYZ]^eZfYgho Jrctd|}|j}t|s t|r |jSy)aGet the index of a DataFrame or a Series, if it's pandas-like. Arguments: obj: Dataframe or Series. Notes: This is only really intended for backwards-compatibility purposes, for example if your library already aligns indices for users. If you're designing a new library, we highly encourage you to not rely on the Index. For non-pandas-like inputs, this returns `None`. Examples: >>> import pandas as pd >>> import polars as pl >>> import narwhals as nw >>> df_pd = pd.DataFrame({"a": [1, 2], "b": [4, 5]}) >>> df = nw.from_native(df_pd) >>> nw.maybe_get_index(df) RangeIndex(start=0, stop=2, step=1) >>> series_pd = pd.Series([1, 2]) >>> series = nw.from_native(series_pd, series_only=True) >>> nw.maybe_get_index(series) RangeIndex(start=0, stop=2, step=1) rN)r to_nativer7r8r)objobj_any native_objs rmaybe_get_indexr_s=45#G""$J +/DZ/P r)rcVddlm}td|}|j}|| d}t||s| d}t||.t |r|Dcgc] }||dc}n ||d}n|}t |r9|j |jj|j|St|r^ddl m } |r d }t|| |||jj }|j |jj|S|Scc}w) aSet the index of a DataFrame or a Series, if it's pandas-like. Arguments: obj: object for which maybe set the index (can be either a Narwhals `DataFrame` or `Series`). column_names: name or list of names of the columns to set as index. For dataframes, only one of `column_names` and `index` can be specified but not both. If `column_names` is passed and `df` is a Series, then a `ValueError` is raised. index: series or list of series to set as index. Raises: ValueError: If one of the following conditions happens - none of `column_names` and `index` are provided - both `column_names` and `index` are provided - `column_names` is provided and `df` is a Series Notes: This is only really intended for backwards-compatibility purposes, for example if your library already aligns indices for users. If you're designing a new library, we highly encourage you to not rely on the Index. For non-pandas-like inputs, this is a no-op. Examples: >>> import pandas as pd >>> import polars as pl >>> import narwhals as nw >>> df_pd = pd.DataFrame({"a": [1, 2], "b": [4, 5]}) >>> df = nw.from_native(df_pd) >>> nw.to_native(nw.maybe_set_index(df, "b")) # doctest: +NORMALIZE_WHITESPACE a b 4 1 5 2 r)rrz8Only one of `column_names` or `index` should be providedz3Either `column_names` or `index` should be providedT) pass_through) set_indexz/Cannot set index using column names on a Series)rf)narwhals.translaterr rrnr7rrrrr8narwhals._pandas_like.utilsrr) r column_namesrrdf_anyrr*idxkeysrs rmaybe_set_indexrs7X- % F!!#JE$5Ho EMCo E";@ @3Ys . @5t4  +%%  # # 0 01E1Ed1K L  Z(9 CCS/ !  00@@ %%f&>&>&K&KJ&WXX M1 AsD&ctd|}|j}t|rX|j}t ||r|S|j |j j|jdSt|rX|j}t ||r|S|j |jj|jdS|S)aReset the index to the default integer index of a DataFrame or a Series, if it's pandas-like. Arguments: obj: Dataframe or Series. Notes: This is only really intended for backwards-compatibility purposes, for example if your library already resets the index for users. If you're designing a new library, we highly encourage you to not rely on the Index. For non-pandas-like inputs, this is a no-op. Examples: >>> import pandas as pd >>> import polars as pl >>> import narwhals as nw >>> df_pd = pd.DataFrame({"a": [1, 2], "b": [4, 5]}, index=([6, 7])) >>> df = nw.from_native(df_pd) >>> nw.to_native(nw.maybe_reset_index(df)) a b 0 1 4 1 2 5 >>> series_pd = pd.Series([1, 2]) >>> series = nw.from_native(series_pd, series_only=True) >>> nw.maybe_get_index(series) RangeIndex(start=0, stop=2, step=1) rT)drop) r rr7__native_namespace___has_default_indexrrr reset_indexr8r)rrrrs rmaybe_reset_indexrs85#G""$J +"779 j*: ;N&&  $ $ 1 1*2H2Hd2H2S T  Z("779 j*: ;N&&  % % 2 2:3I3It3I3T U   Nr)strict)rRrVct|dkrt|Sddfd }dfd }t|}tt ||}t t t|tt|g|S)NrTFc3Kdyw)NTr) first_stoppedsr first_tailzzip_strict..first_tails $ sc3xKs d}t|tjD]}d}t|yw)Nz$zip_strict: first iterable is longerz%zip_strict: first iterable is shorter)rr from_iterable)r*rrrests rzip_tailzzip_strict..zip_tailsB$@C$S/),,T2AAC$S/)s7:)rr)rmzipiterrnextrlmap) iterablesrr iterables_itfirstrrs @@r zip_strictrsp9~!I&!M   ?L$|,jl;ED,/0DU*T*HJ7 7rc.t||jSr)r# RangeIndex)rrs r_is_range_indexr-s c+66 77rc|j}t||xr:|jdk(xr)|jt |k(xr|j dk(S)NrrQ)rrstartstoprmstep)native_frame_or_seriesrrs rrr1sW # ( (E/0  KK1   JJ#e* $  JJ!O rc |jjs|S|j|jj |j j |i|}td|S)a-Convert columns or series to the best possible dtypes using dtypes supporting ``pd.NA``, if df is pandas-like. Arguments: obj: DataFrame or Series. *args: Additional arguments which gets passed through. **kwargs: Additional arguments which gets passed through. Notes: For non-pandas-like inputs, this is a no-op. Also, `args` and `kwargs` just get passed down to the underlying library as-is. Examples: >>> import pandas as pd >>> import polars as pl >>> import narwhals as nw >>> import numpy as np >>> df_pd = pd.DataFrame( ... { ... "a": pd.Series([1, 2, 3], dtype=np.dtype("int32")), ... "b": pd.Series([True, False, np.nan], dtype=np.dtype("O")), ... } ... ) >>> df = nw.from_native(df_pd) >>> nw.to_native( ... nw.maybe_convert_dtypes(df) ... ).dtypes # doctest: +NORMALIZE_WHITESPACE a Int32 b boolean dtype: object r)rfr1r _compliantrrconvert_dtypesr )rrokwargsresults rmaybe_convert_dtypesr=sgB    , , .   ##$BCMMO$B$BD$SF$STF  & ))rcv|dvr|S|dvr|dz S|dvr|dz S|dvr|dz S|dvr|d z Sd |}t|) zScale size in bytes to other size units (eg: "kb", "mb", "gb", "tb"). Arguments: sz: original size in bytes unit: size unit to convert into >bry>kb kilobytesi>mb megabytesi>gb gigabytesi@>tb terabyteslz9`unit` must be one of {'b', 'kb', 'mb', 'gb', 'tb'}, got r)szunitr*s r scale_bytesrfss ~  ""Dy ""G| ""G| ""G| Gx PC S/rcddlm}|jjj}|j}d}t ||r;t |j |jr|jjd}|S|j |jk(rd}|S|j |jk7rd}|S|j}|j}|jr8|jdkr%td|j j dk(}|S|j#r!t%|j&j(}|S|j+r0dd lm}||j0xr|j0j(}|S) aReturn whether indices of categories are semantically meaningful. This is a convenience function to accessing what would otherwise be the `is_ordered` property from the DataFrame Interchange Protocol, see https://data-apis.org/dataframe-protocol/latest/API.html. - For Polars: - Enums are always ordered. - Categoricals are ordered if `dtype.ordering == "physical"`. - For pandas-like APIs: - Categoricals are ordered if `dtype.cat.ordered == True`. - For PyArrow table: - Categoricals are ordered if `dtype.type.ordered == True`. Arguments: series: Input Series. Examples: >>> import narwhals as nw >>> import pandas as pd >>> import polars as pl >>> data = ["x", "y"] >>> >>> s_pd = nw.from_native( ... pd.Series(data, dtype=pd.CategoricalDtype(ordered=True)), series_only=True ... ) >>> nw.is_ordered_categorical(s_pd) True >>> s_pl = nw.from_native( ... pl.Series(data, dtype=pl.Categorical()), series_only=True ... ) >>> nw.is_ordered_categorical(s_pl) False r)InterchangeSeriesF is_orderedT)rQ zpl.Categoricalphysical) is_dictionary)narwhals._interchange.seriesrrrrr#dtype Categoricalrdescribe_categoricalr rrfr5rr orderingr1rOcatorderedrAnarwhals._arrow.utilsrr)rrrrrrrgrs ris_ordered_categoricalr {saF?  % % . . 5 5F((IF)./J f((5!!66|D& M%  $" M! ++ + M!!#$$ >>  5 5 7' A*FLL9BBjPF M  "&**,,-F M __  ;"6;;/GFKK4G4GF Mrc<d}t|dt|||S)Nz}Use `generate_temporary_column_name` instead. `generate_unique_token` is deprecated and it will be removed in future versionsz1.13.0r)n_bytesrprefix)r#generate_temporary_column_name)r rr r*s rgenerate_unique_tokenrs( ?cH5 )'7SY ZZrctd} |t|dz }||vr|S|dz }|dkDrd|d|}t|6)aGenerates a unique column name that is not present in the given list of columns. 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T! !D rc"t|tSr)r#ranger#s ris_ranger2-s c5 !!rcZtt|txrt|t Sr)rOr#rr#s rr'r'1s#  3$BZT-B)B CCrcLt|xst|xs t|Sr)r'r)r/r#s ris_index_selectorr55s+ !%  ( -  # rct|xr#t|dkDxrt|dtxs%t |xst |xs t |Sr&)r rmr#rOr5r2is_compliant_series_boolr#s ris_boolean_selectorr8?sW ! % U3s8a<+TJs1vt.Rs=$z$%=sany) predicatess r predicates_contains_list_of_boolrBOs =*= ==rcxtt|xr%tt|dx}xr t ||Sr)rOr rrr#)rr:rs ris_sequence_ofrDUs> $ "49d+ +U " ub ! rcL|||}|S||| }|S|| |Sd}t|)Nz,Cannot pass both `strict` and `pass_through`r)rrpass_through_defaultr*s rvalidate_strict_and_pass_thoughrG^s_ ~,.+     4!z  L4  =orrF) warn_versionrequiredcdfd }|S)a8Decorator to transition from `native_namespace` to `backend` argument. Arguments: warn_version: Emit a deprecation warning from this version. required: Raise when both `native_namespace`, `backend` are `None`. Returns: Wrapped function, with `native_namespace` **removed**. c6tdfd }|S)Nc|jdd}|jdd}||rd}t||}n2|| d}t|||rdjd}t|||d<|i|S)Nr$rz`native_namespace` is deprecated, please use `backend` instead. Note: `native_namespace` will remain available in `narwhals.stable.v1`. 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If left keys collide with the right keys, append the suffix. If there's no collision, let the right keys be. Arguments: left_on: Left keys. right_on: Right keys. suffix: Suffix to append to right keys. Returns: A map of old to new right keys. c36K|]}|vr|n|ywrr)rkeyleft_onsuffixs rrz(_remap_full_join_keys..~s*8;C7N3%x3r)dictr)rright_onrright_keys_suffixeds` ` r_remap_full_join_keysrns( ?G H12 33rctdrV|jjjdj}|j j ||jSdt|d}t|)zGuards `ArrowDataFrame.from_arrow` w/ safer imports. Arguments: data: Object which implements `__arrow_c_stream__`. context: Initialized compliant object. r)contextzB'pyarrow>=14.0.0' is required for `from_arrow` for object of type r) rrrr%r _dataframe from_arrowrrwModuleNotFoundError)datarrr*s r_into_arrow_tablersp    ' ' 4 4Y ? I I}}''b'9@@@ NObcgOhNkkl mC c ""rc|S)aVisual-only marker for unstable functionality. Arguments: fn: Function to decorate. Returns: Decorated function (unchanged). Examples: >>> from narwhals._utils import unstable >>> @unstable ... def a_work_in_progress_feature(*args): ... return args >>> >>> a_work_in_progress_feature.__name__ 'a_work_in_progress_feature' >>> a_work_in_progress_feature(1, 2, 3) (1, 2, 3) r)rOs runstablers ( Irc.tfddD S)aDetermines if a datetime format string is 'naive', i.e., does not include timezone information. A format is considered naive if it does not contain any of the following - '%s': Unix timestamp - '%z': UTC offset - 'Z' : UTC timezone designator Arguments: format: The datetime format string to check. Returns: bool: True if the format is naive (does not include timezone info), False otherwise. c3&K|]}|v ywrr)rxformats rrz#_is_naive_format..s:11;:s)z%sz%zZr?)rs`r_is_naive_formatrs:(9:: ::rcZeZdZdZd d dZd dZd dZ d d dZddZe ddZ y)not_implementedaMark some functionality as unsupported. Arguments: alias: optional name used instead of the data model hook [`__set_name__`]. Returns: An exception-raising [descriptor]. Notes: - Attribute/method name *doesn't* need to be declared twice - Allows different behavior when looked up on the class vs instance - Allows us to use `isinstance(...)` instead of monkeypatching an attribute to the function Examples: >>> from narwhals._utils import not_implemented >>> class Thing: ... def totally_ready(self) -> str: ... return "I'm ready!" ... ... not_ready_yet = not_implemented() >>> >>> thing = Thing() >>> thing.totally_ready() "I'm ready!" >>> thing.not_ready_yet() Traceback (most recent call last): ... NotImplementedError: 'not_ready_yet' is not implemented for: 'Thing'. ... >>> isinstance(Thing.not_ready_yet, not_implemented) True [`__set_name__`]: https://docs.python.org/3/reference/datamodel.html#object.__set_name__ [descriptor]: https://docs.python.org/3/howto/descriptor.html Nc||_yr)_alias)raliass r__init__znot_implemented.__init__s #( rcfdt|jd|jd|jS)N: r)rr _name_owner_namers r__repr__znot_implemented.__repr__s14:&&'s4+;+;*T>TU !7!7 7~&C""C$TZZ5rc$|jdS)Nraise)r)rrorNs r__call__znot_implemented.__call__s||G$$rc2|}t||S)zAlt constructor, wraps with `@deprecated`. Arguments: message: **Static-only** deprecation message, emitted in an IDE. [descriptor]: https://docs.python.org/3/howto/descriptor.html )r%)rmessagers rr%znot_implemented.deprecatedse"z'"3''rr)rz str | NonerrrM)rtype[_T]rrrr)rz_T | Literal['raise'] | Nonerztype[_T] | Nonerr)rorrNrrr)rr?rrA) rrrrrrrrrrPr%rrrrrsU"H( K. PT4=L $%  ( (rrc(|d|d}t|)Nz is not implemented for: z. If you would like to see this functionality in `narwhals`, please open an issue at: https://github.com/narwhals-dev/narwhals/issues)NotImplementedError)whatrr*s rrrs, (+C73S S c ""rceZdZUdZded<ded<ded< edddZeddZdd Z dd Z dd Z dd Z y )requiresa#Method decorator for raising under certain constraints. Attributes: _min_version: Minimum backend version. _hint: Optional suggested alternative. Examples: >>> from narwhals._utils import requires, Implementation >>> class SomeBackend: ... _implementation = Implementation.PYARROW ... _backend_version = 20, 0, 0 ... ... @requires.backend_version((9000, 0, 0)) ... def really_complex_feature(self) -> str: ... return "hello" >>> backend = SomeBackend() >>> backend.really_complex_feature() Traceback (most recent call last): ... NotImplementedError: `really_complex_feature` is only available in 'pyarrow>=9000.0.0', found version '20.0.0'. r _min_versionr_hint _wrapped_namecD|j|}||_||_|S)zMethod decorator for raising below a minimum `_backend_version`. 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[[ r /  / rN)r)rrrrrrA)rLrrr)r rHrr)rrrztuple[tuple[int, ...], str])rrrr)rO_Method[_IntoContextT, P, R]rr) rrrrrrPrL staticmethodrrrr rrrrrrsm,"! J   99B J ' .  % rrc|j|j|jnd}|j|j|jdznd}|j}|||fS)NrQ)rrrr) str_slicerrrrs rconvert_str_slice_to_int_slicerrsZ/8oo.IGMM)// *tE090J7== (1 ,PTD >>D 4 rcdfd }|S)zSteal the class-level docstring from parent and attach to child `__init__`. Returns: Decorated constructor. Notes: - Passes static typing (mostly) - Passes at runtime c|jdk(r+tttrt|_|Sdt jd|j d}t|)Nrz`@zL` is only allowed to decorate an `__init__` with a class-level doc. Method: z Parent: )rrrrr inherit_docrrx) init_childr* tp_parents rrSzinherit_doc..decoratesp   * ,DOT1R!' !2J  %%&'!..12 m % nr)r_Constructor[_T, P, R2]rrr)rrSs` rrr{s  Orct|tr|n t|}|jdk7r |jnd}|d|jj dS)Nbuiltinsrr)r#rrrlstrip)rr:modules rrwrwsL3%49B mmz9R]]rFXQr{{m $ + +C 00rrXc:t||sdjd|D}d|dt|}|rYd}t|}t |dkDrt|d}||d}d t |zd t |zz}|d ||d |}t |y ) aValidate that an object is an instance of one or more specified types. Parameters: obj: The object to validate. *valid_types: One or more valid types that `obj` is expected to match. param_name: The name of the parameter being validated. Used to improve error message clarity. Raises: TypeError: If `obj` is not an instance of any of the provided `valid_types`. Examples: >>> from narwhals._utils import ensure_type >>> ensure_type(42, int, float) >>> ensure_type("hello", str) >>> ensure_type("hello", int, param_name="test") Traceback (most recent call last): ... TypeError: Expected 'int', got: 'str' test='hello' ^^^^^^^ >>> import polars as pl >>> import pandas as pd >>> df = pl.DataFrame([[1], [2], [3], [4], [5]], schema=[*"abcde"]) >>> ensure_type(df, pd.DataFrame, param_name="df") Traceback (most recent call last): ... TypeError: Expected 'pandas.core.frame.DataFrame', got: 'polars.dataframe.frame.DataFrame' df=polars.dataframe.frame.DataFrame(...) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ z | c32K|]}t|ywr)rw)rr:s rrzensure_type..sL"1"5Lrbz Expected z, got: z (z(...)=rd^r N)r#rrwrrmrx) rrY valid_typestp_namesr*left_padr}assign underlines rr[r[sB c; '::L LL(W-@-E,HI Hs)C3x"},S12%8 z*Q/Fs6{*sSX~>IEF8C59+6Cn (rc(eZdZdZddZddZddZy) _DeferredIterablezLStore a callable producing an iterable to defer collection until we need it.c||_yr _into_iter)r into_iters rrz_DeferredIterable.__init__s 6?rc#@K|jEd{y7wrr*rs r__iter__z_DeferredIterable.__iter__s??$$$s c\|j}t|tr|St|Sr)r+r#rr)rits rto_tuplez_DeferredIterable.to_tuples& __ E*r9b 9rN)r,zCallable[[], Iterable[_T]]rr)rz Iterator[_T])rztuple[_T, ...])rrrrrr.r1rrrr(r(sV@%:rr(@cJ|rdj|g|n|}t|Sr)rr)rnestedrs rdeep_attrgetterr5s%(.388TOFO $DD d rc&t|g||S)z+Perform a nested attribute lookup on `obj`.)r5)rname_1r4s r deep_getattrr8s +?6 +F +C 00rc eZdZy) CompliantN)rrrrrrr:r:srr:c"eZdZdZeddZy)NarwhalsaMinimal *Narwhals-level* protocol. Provides access to a compliant object: obj: Narwhals[NativeT_co]] compliant: Compliant[NativeT_co] = obj._compliant Which itself exposes: implementation: Implementation = compliant.implementation native: NativeT_co = compliant.native This interface is used for revealing which `Implementation` member is associated with **either**: - One or more [nominal] native type(s) - One or more [structural] type(s) - where the true native type(s) are [assignable to] *at least* one of them These relationships are defined in the `@overload`s of `_Implementation.__get__(...)`. [nominal]: https://typing.python.org/en/latest/spec/glossary.html#term-nominal [structural]: https://typing.python.org/en/latest/spec/glossary.html#term-structural [assignable to]: https://typing.python.org/en/latest/spec/glossary.html#term-assignable cyrrrs rrzNarwhals._compliants36rN)rzCompliant[NativeT_co])rrrrrrrrrr<r<s066rr<cjeZdZdZddZeddZeddZeddZeddZe ddZeddZe dd Zedd Ze dd Zedd Zedd Ze d dZed!dZe d"dZed#dZd$dZy)%_ImplementationzDescriptor for matching an opaque `Implementation` on a generic class. 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