Polars: py-0.16.7 Release

🚀 Performance improvements

• add arr.count_match expression and optimize arr.sum for List<Boolean> (#7023)
• optimize selection_to_pyexpr_list (#7020)
• avoid unnecessary function calls in LazyFrame.with_columns() (#7019)
• remove O^2 behavior in melt (#7003)
• Improve performance of expr_to_lit_or_expr for arguments of type Expr by ~80% (#6967)
• improve vec_hash perf for boolean and utf8 (#6963)
• don't pack utf8 columns in grouptuples ~5-15% (#6959)
• don't pack integer keys in determining ~8-18% group tuples. (#6956)
• use fxhash for all integers (#6954)

✨ Enhancements

• add arr.count_match expression and optimize arr.sum for List<Boolean> (#7023)
• add sort for struct dtype (#7021)
• More ergonomic coalesce args (#6989)
• raise informative error if invalid datetime_format passed to write_csv (#7005)
• Improve Series & Numpy arithmetic (#6983)
• More ergonomic agg args (#6982)
• rename parse_dates => try_parse_dates (#6987)
• remove packaging and/or distutils dependency with a minimal version parser utility (#6972)
• More ergonomic over args (#6986)
• add upper_bound and lower_bound methods to Series (#6990)
• More ergonomic col args (#6996)
• More ergonomic sort args (#6896)
• Make groupby agg shortcuts available in lazy (#6944)
• add map_dict method for Series (#6946)

🐞 Bug fixes

• reflect time zone conversion in lazy dataframe schema (#7022)
• ensure set_sorted never panics (#7013)
• fix struct append 0 sliced (#7012)
• fix dtype of diff for uint8 (#7010)
• fix coalesce supertype (#7000)
• if given, respect dtype time zone when instantiating pl.lit value (#6999)
• fix fill_null for categoricals (#6998)
• dtype of pow function (#6985)
• fix is_duplicated for utf8 dtype (#6997)
• Remove check for path to be non-directory if use_pyarrow (#6994)
• if given, respect dtype timeunit when instantiating pl.lit value (#6991)
• Add packaging to runtime dependencies (#6962)
• fix temporal logical types in pivot (#6957)
• typo in mean unit test - changed median -> mean (#6960)
• ensure literals are expanded in streaming (#6952)
• str.contains strict=False took no effect (#6950)

🛠️ Other improvements

• date-time unit tests refactor (#7002)
• test lit series arithmetic order (#7015)
• More test restructure (#6961)
• Properly deprecate .struct.to_frame (#6958)
• Properly deprecate GroupBy.agg_list (#6943)

Thank you to all our contributors for making this release possible! @MarcoGorelli, @MatveyF, @alexander-beedie, @jakob-keller, @mslapek, @ozgrakkurt, @papparapa, @ritchie46, @sorhawell, @stinodego, @xhochy and @zundertj