Polars: py-0.20.5 Release

⚠️ Deprecations

• Deprecate default delimiter value for str.concat (#13690)
• Rename pl.count() to pl.len() (#13719)
• Deprecate dt.with_time_unit in favor of cast(pl.Int64).cast(pl.Datetime(time_unit, time_zone)) (#13667)

🚀 Performance improvements

• directly embed data ptr in Buffer (#13744)

✨ Enhancements

• Impl count_matches for array namespace (#13675)
• Add nulls_last for list/array.sort (#13795)
• convert fixed-offset timezones to respective Etc timezone from time zone database (#13738)
• allow read_excel to load from remote http locations (#13753)
• Expressify str.slice (#13747)
• implement binview for polars-row (#13736)
• implement binview for polars-json (#13737)
• add architecture for polars-flavored IPC (#13734)
• implement binview comparison kernels (#13715)
• raise default frame/series repr height from 8 to 10 (#13699)

🐞 Bug fixes

• do not read data for zero-length compressed buffer (#13791)
• Fix the non-null test of transpose (#13783)
• Raise error instead of panic when joining on wildcard/nth (#13742)
• str.concat correctly ignore single null value (#13751)
• Selectors by_name and by_dtype should allow empty list as input (#11024)
• Keep Series attributes docstrings when read by Sphinx (#13731)
• fix error message when creating DataFrame from 0-dimensional NumPy array (#13729)
• support corr() for single-column DataFrames (#13728)
• Use NonZeroUsize for batch_size parameter in write_csv/sink_csv/scan_ndjson (#13726)
• error instead of panicking in sql if empty function (#13691)

📖 Documentation

• Fix typo in deprecation message of with_row_count (#13793)
• Fix incorrect "coming from pandas" syntax (#13767)
• Improve streaming section of the user guide (#13750)
• improve n_unique and approx_n_unique docs (#13752)
• add missing Series.str.find reference (#13717)
• Be more explicit about behaviour in str.strip_chars / strip_chars_start / strip_chars_end docstrings (#13697)
• Add doc example for datetime_ranges (#13695)
• document %A and %B to get day name and month name (#13678)

🛠️ Other improvements

• Make pl.duration non-anonymous (#13762)
• Add test for describe on Object types (#13689)
• Only run bytecode parser CI workflow for Python 3.9/3.10 (#13664)

Thank you to all our contributors for making this release possible! @29antonioac, @MarcoGorelli, @NedJWestern, @Wainberg, @alexander-beedie, @cgevans, @henryharbeck, @langestefan, @orlp, @petrosbar, @r-brink, @reswqa, @ritchie46, @stinodego and @universalmind303