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

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

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

"""

import sys

import _locale

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

def getpreferredencoding(do_setlocale=True):

return _locale._getdefaultlocale()[1]

else:

try:

_locale.CODESET

except AttributeError:

def getpreferredencoding(do_setlocale=True):

# This path for legacy systems needs the more complex

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

import locale

return locale.getpreferredencoding(do_setlocale)

else:

def getpreferredencoding(do_setlocale=True):

assert not do_setlocale

result = _locale.nl_langinfo(_locale.CODESET)

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

# nl_langinfo can return an empty string

# when the setting has an invalid value.

# Default to UTF-8 in that case because

# UTF-8 is the default charset on OSX and

# returning nothing will crash the

# interpreter.

result = 'UTF-8'

return result