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

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'),
        URIField('business_homepage', field_uri='contacts:BusinessHomePage'),
        TextListField('children', field_uri='contacts:Children'),
        TextListField('companies', field_uri='contacts:Companies', is_searchable=False),
        ChoiceField('contact_source', field_uri='contacts:ContactSource', choices={
            Choice('Store'), Choice('ActiveDirectory')
        }, is_read_only=True),
        TextField('department', field_uri='contacts:Department'),
        TextField('generation', field_uri='contacts:Generation'),
        CharField('im_addresses', field_uri='contacts:ImAddresses', is_read_only=True),
        TextField('job_title', field_uri='contacts:JobTitle'),
        TextField('manager', field_uri='contacts:Manager'),
        TextField('mileage', field_uri='contacts:Mileage'),
        TextField('office', field_uri='contacts:OfficeLocation'),
        ChoiceField('postal_address_index', field_uri='contacts:PostalAddressIndex', choices={
            Choice('Business'), Choice('Home'), Choice('Other'), Choice('None')
        }, default='None', is_required_after_save=True),
        TextField('profession', field_uri='contacts:Profession'),
        TextField('spouse_name', field_uri='contacts:SpouseName'),
        CharField('surname', field_uri='contacts:Surname'),
        DateTimeField('wedding_anniversary', field_uri='contacts:WeddingAnniversary'),
        BooleanField('has_picture', field_uri='contacts:HasPicture', supported_from=EXCHANGE_2010, is_read_only=True),
        TextField('phonetic_full_name', field_uri='contacts:PhoneticFullName', supported_from=EXCHANGE_2013,
                  is_read_only=True),
        TextField('phonetic_first_name', field_uri='contacts:PhoneticFirstName', supported_from=EXCHANGE_2013,
                  is_read_only=True),
        TextField('phonetic_last_name', field_uri='contacts:PhoneticLastName', supported_from=EXCHANGE_2013,

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'),
        URIField('business_homepage', field_uri='contacts:BusinessHomePage'),
        TextListField('children', field_uri='contacts:Children'),
        TextListField('companies', field_uri='contacts:Companies', is_searchable=False),
        ChoiceField('contact_source', field_uri='contacts:ContactSource', choices={
            Choice('Store'), Choice('ActiveDirectory')
        }, is_read_only=True),
        TextField('department', field_uri='contacts:Department'),
        TextField('generation', field_uri='contacts:Generation'),
        CharField('im_addresses', field_uri='contacts:ImAddresses', is_read_only=True),
        TextField('job_title', field_uri='contacts:JobTitle'),
        TextField('manager', field_uri='contacts:Manager'),
        TextField('mileage', field_uri='contacts:Mileage'),
        TextField('office', field_uri='contacts:OfficeLocation'),
        ChoiceField('postal_address_index', field_uri='contacts:PostalAddressIndex', choices={
            Choice('Business'), Choice('Home'), Choice('Other'), Choice('None')
        }, default='None', is_required_after_save=True),
        TextField('profession', field_uri='contacts:Profession'),
        TextField('spouse_name', field_uri='contacts:SpouseName'),
        CharField('surname', field_uri='contacts:Surname'),
        DateTimeField('wedding_anniversary', field_uri='contacts:WeddingAnniversary'),
        BooleanField('has_picture', field_uri='contacts:HasPicture', supported_from=EXCHANGE_2010, is_read_only=True),
        TextField('phonetic_full_name', field_uri='contacts:PhoneticFullName', supported_from=EXCHANGE_2013,
                  is_read_only=True),
        TextField('phonetic_first_name', field_uri='contacts:PhoneticFirstName', supported_from=EXCHANGE_2013,

if val is not None:
            return val
        return self.default


class TextListField(TextField):
    is_list = True

    def from_xml(self, elem, account):
        iter_elem = elem.find(self.response_tag())
        if iter_elem is not None:
            return get_xml_attrs(iter_elem, '{%s}String' % TNS)
        return self.default


class MessageField(TextField):
    INNER_ELEMENT_NAME = 'Message'

    def from_xml(self, elem, account):
        reply = elem.find(self.response_tag())
        if reply is None:
            return None
        message = reply.find('{%s}%s' % (TNS, self.INNER_ELEMENT_NAME))
        if message is None:
            return None
        return message.text

    def to_xml(self, value, version):
        field_elem = create_element(self.request_tag())
        message = create_element('t:%s' % self.INNER_ELEMENT_NAME)
        message.text = value
        return set_xml_value(field_elem, message, version=version)

def reply_all(self, subject, body):
        self.create_reply_all(subject, body).send()


class Task(Item):
    """
    MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/task
    """
    ELEMENT_NAME = 'Task'
    NOT_STARTED = 'NotStarted'
    COMPLETED = 'Completed'
    LOCAL_FIELDS = [
        IntegerField('actual_work', field_uri='task:ActualWork', min=0),
        DateTimeField('assigned_time', field_uri='task:AssignedTime', is_read_only=True),
        TextField('billing_information', field_uri='task:BillingInformation'),
        IntegerField('change_count', field_uri='task:ChangeCount', is_read_only=True, min=0),
        TextListField('companies', field_uri='task:Companies'),
        # 'complete_date' can be set, but is ignored by the server, which sets it to now()
        DateTimeField('complete_date', field_uri='task:CompleteDate', is_read_only=True),
        TextListField('contacts', field_uri='task:Contacts'),
        ChoiceField('delegation_state', field_uri='task:DelegationState', choices={
            Choice('NoMatch'), Choice('OwnNew'), Choice('Owned'), Choice('Accepted'), Choice('Declined'), Choice('Max')
        }, is_read_only=True),
        CharField('delegator', field_uri='task:Delegator', is_read_only=True),
        DateTimeField('due_date', field_uri='task:DueDate'),
        BooleanField('is_editable', field_uri='task:IsAssignmentEditable', is_read_only=True),
        BooleanField('is_complete', field_uri='task:IsComplete', is_read_only=True),
        BooleanField('is_recurring', field_uri='task:IsRecurring', is_read_only=True),
        BooleanField('is_team_task', field_uri='task:IsTeamTask', is_read_only=True),
        TextField('mileage', field_uri='task:Mileage'),
        CharField('owner', field_uri='task:Owner', is_read_only=True),

PhoneNumberField('phone_numbers', field_uri='contacts:PhoneNumber'),
        TextField('assistant_name', field_uri='contacts:AssistantName'),
        DateTimeField('birthday', field_uri='contacts:Birthday'),
        URIField('business_homepage', field_uri='contacts:BusinessHomePage'),
        TextListField('children', field_uri='contacts:Children'),
        TextListField('companies', field_uri='contacts:Companies', is_searchable=False),
        ChoiceField('contact_source', field_uri='contacts:ContactSource', choices={
            Choice('Store'), Choice('ActiveDirectory')
        }, is_read_only=True),
        TextField('department', field_uri='contacts:Department'),
        TextField('generation', field_uri='contacts:Generation'),
        CharField('im_addresses', field_uri='contacts:ImAddresses', is_read_only=True),
        TextField('job_title', field_uri='contacts:JobTitle'),
        TextField('manager', field_uri='contacts:Manager'),
        TextField('mileage', field_uri='contacts:Mileage'),
        TextField('office', field_uri='contacts:OfficeLocation'),
        ChoiceField('postal_address_index', field_uri='contacts:PostalAddressIndex', choices={
            Choice('Business'), Choice('Home'), Choice('Other'), Choice('None')
        }, default='None', is_required_after_save=True),
        TextField('profession', field_uri='contacts:Profession'),
        TextField('spouse_name', field_uri='contacts:SpouseName'),
        CharField('surname', field_uri='contacts:Surname'),
        DateTimeField('wedding_anniversary', field_uri='contacts:WeddingAnniversary'),
        BooleanField('has_picture', field_uri='contacts:HasPicture', supported_from=EXCHANGE_2010, is_read_only=True),
        TextField('phonetic_full_name', field_uri='contacts:PhoneticFullName', supported_from=EXCHANGE_2013,
                  is_read_only=True),
        TextField('phonetic_first_name', field_uri='contacts:PhoneticFirstName', supported_from=EXCHANGE_2013,
                  is_read_only=True),
        TextField('phonetic_last_name', field_uri='contacts:PhoneticLastName', supported_from=EXCHANGE_2013,
                  is_read_only=True),
        EmailAddressField('email_alias', field_uri='contacts:Alias', is_read_only=True),
        # 'notes' is documented in MSDN but apparently unused. Writing to it raises ErrorInvalidPropertyRequest. OWA

kwargs.update(cls.duration_to_start_end(elem=elem, account=account))
        cls._clear(elem)
        return cls(**kwargs)


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

    FIELDS = [
        RecipientAddressField('recipient_address'),
        ChoiceField('pending_mail_tips', field_uri='PendingMailTips', choices={Choice(c) for c in MAIL_TIPS_TYPES}),
        EWSElementField('out_of_office', field_uri='OutOfOffice', value_cls=OutOfOffice),
        BooleanField('mailbox_full', field_uri='MailboxFull'),
        TextField('custom_mail_tip', field_uri='CustomMailTip'),
        IntegerField('total_member_count', field_uri='TotalMemberCount'),
        IntegerField('external_member_count', field_uri='ExternalMemberCount'),
        IntegerField('max_message_size', field_uri='MaxMessageSize'),
        BooleanField('delivery_restricted', field_uri='DeliveryRestricted'),
        BooleanField('is_moderated', field_uri='IsModerated'),
        BooleanField('invalid_recipient', field_uri='InvalidRecipient'),
    ]

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


ENTRY_ID = 'EntryId'  # The base64-encoded PR_ENTRYID property
EWS_ID = 'EwsId'  # The EWS format used in Exchange 2007 SP1 and later
EWS_LEGACY_ID = 'EwsLegacyId'  # The EWS format used in Exchange 2007 before SP1
HEX_ENTRY_ID = 'HexEntryId'  # The hexadecimal representation of the PR_ENTRYID property
OWA_ID = 'OwaId'  # The OWA format for Exchange 2007 and 2010

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),
        MessageHeaderField('headers', field_uri='item:InternetMessageHeaders', is_read_only=True),
        DateTimeField('datetime_sent', field_uri='item:DateTimeSent', is_read_only=True),

IdField('id', field_uri=ID_ATTR, is_required=True),
        IdField('root_id', field_uri=ROOT_ID_ATTR),
        IdField('root_changekey', field_uri=ROOT_CHANGEKEY_ATTR),
    ]

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


class Attachment(EWSElement):
    """Base class for FileAttachment and ItemAttachment
    """
    FIELDS = [
        EWSElementField('attachment_id', value_cls=AttachmentId),
        TextField('name', field_uri='Name'),
        TextField('content_type', field_uri='ContentType'),
        TextField('content_id', field_uri='ContentId'),
        URIField('content_location', field_uri='ContentLocation'),
        IntegerField('size', field_uri='Size', is_read_only=True),  # Attachment size in bytes
        DateTimeField('last_modified_time', field_uri='LastModifiedTime'),
        BooleanField('is_inline', field_uri='IsInline'),
    ]

    __slots__ = tuple(f.name for f in FIELDS) + ('parent_item',)

    def __init__(self, **kwargs):
        self.parent_item = kwargs.pop('parent_item', None)
        super(Attachment, self).__init__(**kwargs)

    def clean(self, version=None):
        from .items import Item
        if self.parent_item is not None and not isinstance(self.parent_item, Item):
            raise ValueError("'parent_item' value %r must be an Item instance" % self.parent_item)

__slots__ = tuple()


class FolderId(ItemId):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/folderid"""
    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

def supported_choices(self, version):
        return list(c.value for c in self.choices if c.supports_version(version))


FREE_BUSY_CHOICES = [Choice('Free'), Choice('Tentative'), Choice('Busy'), Choice('OOF'), Choice('NoData'),
                     Choice('WorkingElsewhere', supported_from=EXCHANGE_2013)]


class FreeBusyStatusField(ChoiceField):
    def __init__(self, *args, **kwargs):
        kwargs['choices'] = set(FREE_BUSY_CHOICES)
        super(FreeBusyStatusField, self).__init__(*args, **kwargs)


class BodyField(TextField):
    def __init__(self, *args, **kwargs):
        from .properties import Body
        self.value_cls = Body
        super(BodyField, self).__init__(*args, **kwargs)

    def clean(self, value, version=None):
        if value is not None and not isinstance(value, self.value_cls):
            value = self.value_cls(value)
        return super(BodyField, self).clean(value, version=version)

    def from_xml(self, elem, account):
        from .properties import Body, HTMLBody
        field_elem = elem.find(self.response_tag())
        val = None if field_elem is None else field_elem.text or None
        if val is not None:
            body_type = field_elem.get('BodyType')