"""A minimal subset of the locale module used at interpreter startup

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(imported by the _io module), in order to reduce startup time.

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Don't import directly from third-party code; use the `locale` module instead!

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"""

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import sys

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import _locale

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if sys.platform.startswith("win"):

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def getpreferredencoding(do_setlocale=True):

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if sys.flags.utf8_mode:

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return 'UTF-8'

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return _locale._getdefaultlocale()[1]

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else:

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try:

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_locale.CODESET

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except AttributeError:

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if hasattr(sys, 'getandroidapilevel'):

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# On Android langinfo.h and CODESET are missing, and UTF-8 is

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# always used in mbstowcs() and wcstombs().

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def getpreferredencoding(do_setlocale=True):

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return 'UTF-8'

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else:

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def getpreferredencoding(do_setlocale=True):

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if sys.flags.utf8_mode:

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return 'UTF-8'

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# This path for legacy systems needs the more complex

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# getdefaultlocale() function, import the full locale module.

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import locale

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return locale.getpreferredencoding(do_setlocale)

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else:

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def getpreferredencoding(do_setlocale=True):

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assert not do_setlocale

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if sys.flags.utf8_mode:

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return 'UTF-8'

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result = _locale.nl_langinfo(_locale.CODESET)

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if not result and sys.platform == 'darwin':

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# nl_langinfo can return an empty string

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# when the setting has an invalid value.

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# Default to UTF-8 in that case because

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# UTF-8 is the default charset on OSX and

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# returning nothing will crash the

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# interpreter.

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result = 'UTF-8'

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return result

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