pyobject2xml.py

from dateutil.parser import parse as dateutil_parse
from lxml import etree, objectify as xobject


def is_clean(element):
    if not element.getchildren() and element.text is None:
        return False
    return all(is_clean(child) for child in element.iterchildren())


class BaseType(object):
    """Base data binding object
    """
    tagname = None
    namespace = None
    nsmap = None

    def __repr__(self):
        return '<%s>' % self.tagname

    @classmethod
    def make_element(cls, tagname, value=None, namespace=None, nsmap=None):
        M = xobject.ElementMaker(annotate=False, namespace=namespace,
                                 nsmap=nsmap)
        return M(tagname, value)

    @property
    def xml(self):
        if isinstance(self, (ListType, DateType)):
            return self.make_element(self.tagname, self.value, namespace=self.namespace)
        tag = self.make_element(self.tagname, namespace=self.namespace, nsmap=self.nsmap)
        for subelt in self.sequence:
            attr = getattr(self, subelt, None)
            if not attr:
                continue
            if isinstance(attr, (str, unicode)):
                tag.append(self.make_element(subelt, attr, namespace=self.namespace))
            else:
                xml = attr.xml
                if not is_clean(xml):
                    continue
                tag.append(xml)
        xobject.deannotate(tag, xsi_nil=True)
        return tag

    def __str__(self):
        return etree.tostring(self.xml, pretty_print=True)


class ListType(BaseType):
    """Data binding class for ListType
    """
    allowed_values = None

    def __init__(self, value):
        if value not in self.allowed_values:
            raise ValueError('<%s> value (%s) not in %s' % (self.tagname, value,
                                                            self.allowed_values))
        self.value = value


class DateType(BaseType):

    def __init__(self, value):
        self.value = dateutil_parse(value).date().isoformat()


class ComplexType(BaseType):
    """Data binding class for ComplexType
    """
    sequence = None


# Couple example of Python objects

class Sex(ListType):
    tagname = 'Sexe'
    allowed_values = ('M', 'F')


class Credentials(ComplexType):
    tagname = 'credentials'
    sequence = ('login', 'password')

    def __init__(self, data):
        self.login = data['login']
        self.password = data['password']


class Profile(ComplexType):
    tagname = 'online'
    sequence = ('url', 'credentials')

    def __init__(self, data):
        self.url = data['url']
        self.credentials = Credentials(data)


class Identity(ComplexType):
    tagname = 'Identite'
    sequence = ('firstname', 'lastname', 'birthdate')

    def __init__(self, data):
        self.firstname = data['firstname']
        self.lastname = data['lastname']
        self.birthdate = data['birthdate']


class Address(ComplexType):
    tagname = 'Adresse'
    sequence = ('street', 'city', 'county', 'state', 'zipcode')

    def __init__(self, data):
        self.street = data['address_street']
        self.city = data['address_city']
        self.county = data['address_county']
        self.state = data['address_state']
        self.zipcode = data['address_zipcode']


class Person(ComplexType):
    tagname = 'Personne'
    sequence = ('identity', 'sex', 'address', 'profile')

    def __init__(self, data):
        self.identity = Identity(data)
        self.sex = Sex(data['sex'])
        self.address = Address(data)
        self.profile = Profile(data)


# Data

DATA = {
    'firstname': 'Josh',
    'lastname': 'Loking',
    'sex': 'M',
    'birthdate': '2000-11-11',
    'address_street': 'Main Street G. Washington',
    'address_city': 'Ravenhill',
    'address_county': 'Orange',
    'address_state': 'Tennesse',
    'address_zipcode': '99999',
    'url': 'https://twitter.com/t0k3n',
    'login': 't0k3n@example.com',
    'password': 'Hakarimashita'
}


if __name__ == '__main__':
    person = Person(DATA)
    print(person)

Here is the result

josue%debian:~/workspace/reddit$
<Personne xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Identite>
    <firstname>Josh</firstname>
    <lastname>Loking</lastname>
    <birthdate>2000-11-11</birthdate>
  </Identite>
  <Sexe>M</Sexe>
  <Adresse>
    <street>Main Street G. Washington</street>
    <city>Ravenhill</city>
    <county>Orange</county>
    <state>Tennesse</state>
    <zipcode>99999</zipcode>
  </Adresse>
</Personne>

josue%debian:~/workspace/reddit/pyobj2xml$python pyobject2xml.py 
<Personne xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Identite>
    <firstname>Josh</firstname>
    <lastname>Loking</lastname>
    <birthdate>2000-11-11</birthdate>
  </Identite>
  <Sexe>M</Sexe>
  <Adresse>
    <street>Main Street G. Washington</street>
    <city>Ravenhill</city>
    <county>Orange</county>
    <state>Tennesse</state>
    <zipcode>99999</zipcode>
  </Adresse>
  <online>
    <url>https://twitter.com/t0k3n</url>
    <credentials>
      <login>t0k3n@example.com</login>
      <password>Hakarimashita</password>
    </credentials>
  </online>
</Personne>