How to use the exchangelib.fields.Choice function in exchangelib

def test_versioned_choice(self):
        field = ChoiceField('foo', field_uri='bar', choices={
            Choice('c1'), Choice('c2', supported_from=EXCHANGE_2010)
        })
        with self.assertRaises(ValueError):
            field.clean('XXX')  # Value must be a valid choice
        field.clean('c2', version=None)
        with self.assertRaises(ErrorInvalidServerVersion):
            field.clean('c2', version=Version(EXCHANGE_2007))
        field.clean('c2', version=Version(EXCHANGE_2010))
        field.clean('c2', version=Version(EXCHANGE_2013))

]

    __slots__ = tuple(f.name for f in FIELDS)


class MultiFieldIndexedElement(IndexedElement):
    """Base class for all classes that implement an indexed element with multiple fields"""
    __slots__ = tuple()


class PhysicalAddress(MultiFieldIndexedElement):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/entry-physicaladdress"""
    ELEMENT_NAME = 'Entry'
    FIELDS = [
        LabelField('label', field_uri='Key', choices={
            Choice('Business'), Choice('Home'), Choice('Other')
        }, default='Business'),
        NamedSubField('street', field_uri='Street'),  # Street, house number, etc.
        NamedSubField('city', field_uri='City'),
        NamedSubField('state', field_uri='State'),
        NamedSubField('country', field_uri='CountryOrRegion'),
        NamedSubField('zipcode', field_uri='PostalCode'),
    ]

    __slots__ = tuple(f.name for f in FIELDS)

    def clean(self, version=None):
        # pylint: disable=access-member-before-definition
        if isinstance(self.zipcode, int):
            self.zipcode = text_type(self.zipcode)
        super(PhysicalAddress, self).clean(version=version)

is_required=True, default='Unknown'),
    ]
    FIELDS = Item.FIELDS + LOCAL_FIELDS

    __slots__ = tuple(f.name for f in LOCAL_FIELDS)


class MeetingRequest(BaseMeetingItem, AcceptDeclineMixIn):
    """
    MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/meetingrequest
    """
    ELEMENT_NAME = 'MeetingRequest'
    LOCAL_FIELDS = [
        ChoiceField('meeting_request_type', field_uri='meetingRequest:MeetingRequestType',
                    choices={Choice('FullUpdate'), Choice('InformationalUpdate'), Choice('NewMeetingRequest'),
                             Choice('None'), Choice('Outdated'), Choice('PrincipalWantsCopy'),
                             Choice('SilentUpdate')},
                    default='None'),
        ChoiceField('intended_free_busy_status', field_uri='meetingRequest:IntendedFreeBusyStatus', choices={
                    Choice('Free'), Choice('Tentative'), Choice('Busy'), Choice('OOF'), Choice('NoData')},
                    is_required=True, default='Busy'),
    ] + [f for f in CalendarItem.LOCAL_FIELDS[1:] if f.name != 'is_response_requested']

    # FIELDS on this element are shuffled compared to other elements
    culture_idx = None
    for i, field in enumerate(Item.FIELDS):
        if field.name == 'culture':
            culture_idx = i
            break
    FIELDS = Item.FIELDS[:culture_idx + 1] + BaseMeetingItem.LOCAL_FIELDS + LOCAL_FIELDS + Item.FIELDS[culture_idx + 1:]

    __slots__ = tuple(f.name for f in LOCAL_FIELDS)

self.status = Task.COMPLETED
        self.percent_complete = Decimal(100)
        self.save()


class Contact(Item):
    """
    MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/contact
    """
    ELEMENT_NAME = 'Contact'
    LOCAL_FIELDS = [
        TextField('file_as', field_uri='contacts:FileAs'),
        ChoiceField('file_as_mapping', field_uri='contacts:FileAsMapping', choices={
            Choice('None'), Choice('LastCommaFirst'), Choice('FirstSpaceLast'), Choice('Company'),
            Choice('LastCommaFirstCompany'), Choice('CompanyLastFirst'), Choice('LastFirst'),
            Choice('LastFirstCompany'), Choice('CompanyLastCommaFirst'), Choice('LastFirstSuffix'),
            Choice('LastSpaceFirstCompany'), Choice('CompanyLastSpaceFirst'), Choice('LastSpaceFirst'),
            Choice('DisplayName'), Choice('FirstName'), Choice('LastFirstMiddleSuffix'), Choice('LastName'),
            Choice('Empty'),
        }),
        TextField('display_name', field_uri='contacts:DisplayName', is_required=True),
        CharField('given_name', field_uri='contacts:GivenName'),
        TextField('initials', field_uri='contacts:Initials'),
        CharField('middle_name', field_uri='contacts:MiddleName'),
        TextField('nickname', field_uri='contacts:Nickname'),
        # Placeholder for CompleteName
        TextField('company_name', field_uri='contacts:CompanyName'),
        EmailAddressesField('email_addresses', field_uri='contacts:EmailAddress'),
        PhysicalAddressField('physical_addresses', field_uri='contacts:PhysicalAddress'),
        PhoneNumberField('phone_numbers', field_uri='contacts:PhoneNumber'),
        TextField('assistant_name', field_uri='contacts:AssistantName'),
        DateTimeField('birthday', field_uri='contacts:Birthday'),

__slots__ = tuple(f.name for f in LOCAL_FIELDS)


class MeetingRequest(BaseMeetingItem, AcceptDeclineMixIn):
    """
    MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/meetingrequest
    """
    ELEMENT_NAME = 'MeetingRequest'
    LOCAL_FIELDS = [
        ChoiceField('meeting_request_type', field_uri='meetingRequest:MeetingRequestType',
                    choices={Choice('FullUpdate'), Choice('InformationalUpdate'), Choice('NewMeetingRequest'),
                             Choice('None'), Choice('Outdated'), Choice('PrincipalWantsCopy'),
                             Choice('SilentUpdate')},
                    default='None'),
        ChoiceField('intended_free_busy_status', field_uri='meetingRequest:IntendedFreeBusyStatus', choices={
                    Choice('Free'), Choice('Tentative'), Choice('Busy'), Choice('OOF'), Choice('NoData')},
                    is_required=True, default='Busy'),
    ] + [f for f in CalendarItem.LOCAL_FIELDS[1:] if f.name != 'is_response_requested']

    # FIELDS on this element are shuffled compared to other elements
    culture_idx = None
    for i, field in enumerate(Item.FIELDS):
        if field.name == 'culture':
            culture_idx = i
            break
    FIELDS = Item.FIELDS[:culture_idx + 1] + BaseMeetingItem.LOCAL_FIELDS + LOCAL_FIELDS + Item.FIELDS[culture_idx + 1:]

    __slots__ = tuple(f.name for f in LOCAL_FIELDS)


class MeetingMessage(BaseMeetingItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/meetingmessage"""

LabelField('label', field_uri='Key', choices={
            Choice('EmailAddress1'), Choice('EmailAddress2'), Choice('EmailAddress3')
        }, default='EmailAddress1'),
        EmailSubField('email'),
    ]

    __slots__ = tuple(f.name for f in FIELDS)


class PhoneNumber(SingleFieldIndexedElement):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/entry-phonenumber"""
    ELEMENT_NAME = 'Entry'
    FIELDS = [
        LabelField('label', field_uri='Key', choices={
            Choice('AssistantPhone'), Choice('BusinessFax'), Choice('BusinessPhone'), Choice('BusinessPhone2'),
            Choice('Callback'), Choice('CarPhone'), Choice('CompanyMainPhone'), Choice('HomeFax'), Choice('HomePhone'),
            Choice('HomePhone2'), Choice('Isdn'), Choice('MobilePhone'), Choice('OtherFax'), Choice('OtherTelephone'),
            Choice('Pager'), Choice('PrimaryPhone'), Choice('RadioPhone'), Choice('Telex'), Choice('TtyTddPhone'),
        }, default='PrimaryPhone'),
        SubField('phone_number'),
    ]

    __slots__ = tuple(f.name for f in FIELDS)


class MultiFieldIndexedElement(IndexedElement):
    """Base class for all classes that implement an indexed element with multiple fields"""
    __slots__ = tuple()


class PhysicalAddress(MultiFieldIndexedElement):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/entry-physicaladdress"""

MimeContentField('mime_content', field_uri='item:MimeContent', is_read_only_after_send=True),
        EWSElementField('parent_folder_id', field_uri='item:ParentFolderId', value_cls=ParentFolderId,
                        is_read_only=True),
        CharField('item_class', field_uri='item:ItemClass', is_read_only=True),
        CharField('subject', field_uri='item:Subject'),
        ChoiceField('sensitivity', field_uri='item:Sensitivity', choices={
            Choice('Normal'), Choice('Personal'), Choice('Private'), Choice('Confidential')
        }, is_required=True, default='Normal'),
        TextField('text_body', field_uri='item:TextBody', is_read_only=True, supported_from=EXCHANGE_2013),
        BodyField('body', field_uri='item:Body'),  # Accepts and returns Body or HTMLBody instances
        AttachmentField('attachments', field_uri='item:Attachments'),  # ItemAttachment or FileAttachment
        DateTimeField('datetime_received', field_uri='item:DateTimeReceived', is_read_only=True),
        IntegerField('size', field_uri='item:Size', is_read_only=True),  # Item size in bytes
        CharListField('categories', field_uri='item:Categories'),
        ChoiceField('importance', field_uri='item:Importance', choices={
            Choice('Low'), Choice('Normal'), Choice('High')
        }, is_required=True, default='Normal'),
        TextField('in_reply_to', field_uri='item:InReplyTo'),
        BooleanField('is_submitted', field_uri='item:IsSubmitted', is_read_only=True),
        BooleanField('is_draft', field_uri='item:IsDraft', is_read_only=True),
        BooleanField('is_from_me', field_uri='item:IsFromMe', is_read_only=True),
        BooleanField('is_resend', field_uri='item:IsResend', is_read_only=True),
        BooleanField('is_unmodified', field_uri='item:IsUnmodified', is_read_only=True),
        MessageHeaderField('headers', field_uri='item:InternetMessageHeaders', is_read_only=True),
        DateTimeField('datetime_sent', field_uri='item:DateTimeSent', is_read_only=True),
        DateTimeField('datetime_created', field_uri='item:DateTimeCreated', is_read_only=True),
        # Placeholder for ResponseObjects
        DateTimeField('reminder_due_by', field_uri='item:ReminderDueBy', is_required_after_save=True,
                      is_searchable=False),
        BooleanField('reminder_is_set', field_uri='item:ReminderIsSet', is_required=True, default=False),
        IntegerField('reminder_minutes_before_start', field_uri='item:ReminderMinutesBeforeStart',
                     is_required_after_save=True, min=0, default=0),

ELEMENT_NAME = 'FolderId'

    __slots__ = tuple()


class Mailbox(EWSElement):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/mailbox"""
    ELEMENT_NAME = 'Mailbox'

    FIELDS = [
        TextField('name', field_uri='Name'),
        EmailAddressField('email_address', field_uri='EmailAddress'),
        ChoiceField('routing_type', field_uri='RoutingType', choices={Choice('SMTP')}, default='SMTP'),
        ChoiceField('mailbox_type', field_uri='MailboxType', choices={
            Choice('Mailbox'), Choice('PublicDL'), Choice('PrivateDL'), Choice('Contact'), Choice('PublicFolder'),
            Choice('Unknown'), Choice('OneOff'), Choice('GroupMailbox', supported_from=EXCHANGE_2013)
        }, default='Mailbox'),
        EWSElementField('item_id', value_cls=ItemId, is_read_only=True),
    ]

    __slots__ = tuple(f.name for f in FIELDS)

    def clean(self, version=None):
        super(Mailbox, self).clean(version=version)
        if not self.email_address and not self.item_id:
            # See "Remarks" section of
            # https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/mailbox
            raise ValueError("Mailbox must have either 'email_address' or 'item_id' set")

    def __hash__(self):
        # Exchange may add 'mailbox_type' and 'name' on insert. We're satisfied if the item_id or email address matches.
        if self.item_id:

class Item(BaseItem):
    """
    MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/item
    """
    ELEMENT_NAME = 'Item'

    LOCAL_FIELDS = [
        MimeContentField('mime_content', field_uri='item:MimeContent', is_read_only_after_send=True),
        EWSElementField('parent_folder_id', field_uri='item:ParentFolderId', value_cls=ParentFolderId,
                        is_read_only=True),
        CharField('item_class', field_uri='item:ItemClass', is_read_only=True),
        CharField('subject', field_uri='item:Subject'),
        ChoiceField('sensitivity', field_uri='item:Sensitivity', choices={
            Choice('Normal'), Choice('Personal'), Choice('Private'), Choice('Confidential')
        }, is_required=True, default='Normal'),
        TextField('text_body', field_uri='item:TextBody', is_read_only=True, supported_from=EXCHANGE_2013),
        BodyField('body', field_uri='item:Body'),  # Accepts and returns Body or HTMLBody instances
        AttachmentField('attachments', field_uri='item:Attachments'),  # ItemAttachment or FileAttachment
        DateTimeField('datetime_received', field_uri='item:DateTimeReceived', is_read_only=True),
        IntegerField('size', field_uri='item:Size', is_read_only=True),  # Item size in bytes
        CharListField('categories', field_uri='item:Categories'),
        ChoiceField('importance', field_uri='item:Importance', choices={
            Choice('Low'), Choice('Normal'), Choice('High')
        }, is_required=True, default='Normal'),
        TextField('in_reply_to', field_uri='item:InReplyTo'),
        BooleanField('is_submitted', field_uri='item:IsSubmitted', is_read_only=True),
        BooleanField('is_draft', field_uri='item:IsDraft', is_read_only=True),
        BooleanField('is_from_me', field_uri='item:IsFromMe', is_read_only=True),
        BooleanField('is_resend', field_uri='item:IsResend', is_read_only=True),
        BooleanField('is_unmodified', field_uri='item:IsUnmodified', is_read_only=True),