[pull] main from python:main#1294
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… the timestamp (GH-154328) Some file systems (UFS and ZFS on illumos) reject timestamps that do not fit in 32 bits with EOVERFLOW instead of raising OverflowError. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
…H-153694) Guess the dialect by parsing the sample with every plausible combination of delimiter, quotechar and escapechar, using the actual CSV parser in strict mode, and choosing the combination which splits the sample into rows with the most consistent number of fields. The old heuristics, which guessed the delimiter from characters adjacent to quotes and from character frequencies, are removed. A large sample is parsed incrementally: first only its beginning, then, after eliminating the combinations which are clearly worse than the leader, a several times larger part, and so on. * csv.Sniffer can now detect escapechar='\\'. * Explicitly requested delimiters are no longer restricted to ASCII. * A delimiter inside a quoted field no longer wins over the actual delimiter, and sniffing no longer takes quadratic time on quoted samples. * The sample can be cut off at an arbitrary point: in the middle of a row, of a quoted field or of an escaped sequence. * Only '\r', '\n' and '\r\n' are treated as row separators, so characters like '\x1c' can now be detected as a delimiter. * A preamble (title or comment lines) before the data does not prevent detection if the data rows outnumber the preamble lines. * A sample consisting of a single column of quoted fields now raises csv.Error instead of guessing a delimiter from the content of the fields, and Sniffer.has_header() no longer raises ValueError for such samples. * doublequote is detected by comparing the two readings of the sample. Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Solaris silently converts resource limits that do not fit in a signed 64-bit integer to RLIM_INFINITY. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
…lled (#154223) Output already read when communicate() is cancelled (e.g. by a wait_for() timeout) is now retained on the Process and returned by a subsequent communicate() call, matching subprocess.Popen.communicate() behaviour on timeout. Passing input to a communicate() call following a cancelled one now raises ValueError.
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