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- import datetime
- from decimal import Decimal
- import types
- import six
-
-
- def is_protected_type(obj):
- """Determine if the object instance is of a protected type.
-
- Objects of protected types are preserved as-is when passed to
- force_unicode(strings_only=True).
- """
- return isinstance(obj, (
- six.integer_types +
- (types.NoneType,
- datetime.datetime, datetime.date, datetime.time,
- float, Decimal))
- )
-
-
- def force_unicode(s, encoding='utf-8', strings_only=False, errors='strict'):
- """
- Similar to smart_text, except that lazy instances are resolved to
- strings, rather than kept as lazy objects.
-
- If strings_only is True, don't convert (some) non-string-like objects.
- """
- # Handle the common case first, saves 30-40% when s is an instance of
- # six.text_type. This function gets called often in that setting.
- if isinstance(s, six.text_type):
- return s
- if strings_only and is_protected_type(s):
- return s
- try:
- if not isinstance(s, six.string_types):
- if hasattr(s, '__unicode__'):
- s = s.__unicode__()
- else:
- if six.PY3:
- if isinstance(s, bytes):
- s = six.text_type(s, encoding, errors)
- else:
- s = six.text_type(s)
- else:
- s = six.text_type(bytes(s), encoding, errors)
- else:
- # Note: We use .decode() here, instead of six.text_type(s,
- # encoding, errors), so that if s is a SafeBytes, it ends up being
- # a SafeText at the end.
- s = s.decode(encoding, errors)
- except UnicodeDecodeError as e:
- if not isinstance(s, Exception):
- raise UnicodeDecodeError(*e.args)
- else:
- # If we get to here, the caller has passed in an Exception
- # subclass populated with non-ASCII bytestring data without a
- # working unicode method. Try to handle this without raising a
- # further exception by individually forcing the exception args
- # to unicode.
- s = ' '.join([force_unicode(arg, encoding, strings_only,
- errors) for arg in s])
- return s
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