Eryk Sun <[email protected]> added the comment:
I'm closing this as a third-party issue with older versions of PowerShell.
Newer versions of PowerShell set the output encoding to UTF-8 without a BOM
preamble. For example:
PS C:\> $PSVersionTable.PSVersion
Major Minor Patch PreReleaseLabel BuildLabel
----- ----- ----- --------------- ----------
7 0 3
PS C:\> $OutputEncoding.EncodingName
Unicode (UTF-8)
PS C:\> echo ¡¢£¤¥ | py -3 -X utf8 -c "print(ascii(input()))"
'\xa1\xa2\xa3\xa4\xa5'
It's still possible to manually set the output encoding to include a BOM
preamble. For example:
PS C:\> $OutputEncoding = [System.Text.Encoding]::UTF8
PS C:\> $OutputEncoding.GetPreamble()
239
187
191
PS C:\> echo ¡¢£¤¥ | py -3 -X utf8 -c "print(ascii(input()))"
'\ufeff\xa1\xa2\xa3\xa4\xa5'
I don't know what would be appropriate for Python's I/O stack in terms of
detecting and handling a UTF-8 preamble on any type of file (console/terminal,
pipe, disk), i.e. using the "utf-8-sig" encoding instead of "utf-8", as opposed
to just letting scripts detect and handle an initial BOM character (U+FEFF)
however they see fit. But that discussion needs a new issue if people are
interested in supporting new behavior.
----------
resolution: -> third party
stage: -> resolved
status: open -> closed
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Python tracker <[email protected]>
<https://bugs.python.org/issue21927>
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