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[3.7] bpo-34512: Document platform-specific strftime() behavior for non-ASCII format strings (GH-8948) #11535

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miss-islington merged 1 commit into from
Jan 12, 2019
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[3.7] bpo-34512: Document platform-specific strftime() behavior for non-ASCII format strings (GH-8948) #11535

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6 changes: 6 additions & 0 deletions Doc/library/datetime.rst
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Expand Up @@ -2034,6 +2034,12 @@ calls the platform C library's :func:`strftime` function, and platform
variations are common. To see the full set of format codes supported on your
platform, consult the :manpage:`strftime(3)` documentation.

For the same reason, handling of format strings containing Unicode code points
that can't be represented in the charset of the current locale is also
platform-dependent. On some platforms such code points are preserved intact in
the output, while on others ``strftime`` may raise :exc:`UnicodeError` or return
an empty string instead.

The following is a list of all the format codes that the C standard (1989
version) requires, and these work on all platforms with a standard C
implementation. Note that the 1999 version of the C standard added additional
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