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diff --git a/lib/python2.7/site-packages/django/core/exceptions.py b/lib/python2.7/site-packages/django/core/exceptions.py
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+"""
+Global Django exception and warning classes.
+"""
+from functools import reduce
+import operator
+
+from django.utils.encoding import force_text
+
+
+class DjangoRuntimeWarning(RuntimeWarning):
+ pass
+
+
+class ObjectDoesNotExist(Exception):
+ """The requested object does not exist"""
+ silent_variable_failure = True
+
+
+class MultipleObjectsReturned(Exception):
+ """The query returned multiple objects when only one was expected."""
+ pass
+
+
+class SuspiciousOperation(Exception):
+ """The user did something suspicious"""
+
+
+class SuspiciousMultipartForm(SuspiciousOperation):
+ """Suspect MIME request in multipart form data"""
+ pass
+
+
+class SuspiciousFileOperation(SuspiciousOperation):
+ """A Suspicious filesystem operation was attempted"""
+ pass
+
+
+class DisallowedHost(SuspiciousOperation):
+ """HTTP_HOST header contains invalid value"""
+ pass
+
+
+class DisallowedRedirect(SuspiciousOperation):
+ """Redirect to scheme not in allowed list"""
+ pass
+
+
+class PermissionDenied(Exception):
+ """The user did not have permission to do that"""
+ pass
+
+
+class ViewDoesNotExist(Exception):
+ """The requested view does not exist"""
+ pass
+
+
+class MiddlewareNotUsed(Exception):
+ """This middleware is not used in this server configuration"""
+ pass
+
+
+class ImproperlyConfigured(Exception):
+ """Django is somehow improperly configured"""
+ pass
+
+
+class FieldError(Exception):
+ """Some kind of problem with a model field."""
+ pass
+
+
+NON_FIELD_ERRORS = '__all__'
+
+
+class ValidationError(Exception):
+ """An error while validating data."""
+ def __init__(self, message, code=None, params=None):
+ """
+ ValidationError can be passed any object that can be printed (usually
+ a string), a list of objects or a dictionary.
+ """
+ if isinstance(message, dict):
+ self.error_dict = message
+ elif isinstance(message, list):
+ self.error_list = message
+ else:
+ self.code = code
+ self.params = params
+ self.message = message
+ self.error_list = [self]
+
+ @property
+ def message_dict(self):
+ message_dict = {}
+ for field, messages in self.error_dict.items():
+ message_dict[field] = []
+ for message in messages:
+ if isinstance(message, ValidationError):
+ message_dict[field].extend(message.messages)
+ else:
+ message_dict[field].append(force_text(message))
+ return message_dict
+
+ @property
+ def messages(self):
+ if hasattr(self, 'error_dict'):
+ message_list = reduce(operator.add, self.error_dict.values())
+ else:
+ message_list = self.error_list
+
+ messages = []
+ for message in message_list:
+ if isinstance(message, ValidationError):
+ params = message.params
+ message = message.message
+ if params:
+ message %= params
+ message = force_text(message)
+ messages.append(message)
+ return messages
+
+ def __str__(self):
+ if hasattr(self, 'error_dict'):
+ return repr(self.message_dict)
+ return repr(self.messages)
+
+ def __repr__(self):
+ return 'ValidationError(%s)' % self
+
+ def update_error_dict(self, error_dict):
+ if hasattr(self, 'error_dict'):
+ if error_dict:
+ for k, v in self.error_dict.items():
+ error_dict.setdefault(k, []).extend(v)
+ else:
+ error_dict = self.error_dict
+ else:
+ error_dict[NON_FIELD_ERRORS] = self.error_list
+ return error_dict