def __init__(self, arg1, arg2=None):
		self.doctype = self.name = None
		self._default_new_docs = {}
		self.flags = frappe._dict()

		if arg1 and isinstance(arg1, basestring):
			if not arg2:
				# single
				self.doctype = self.name = arg1
			else:
				self.doctype = arg1
				if isinstance(arg2, dict):
					# filter
					self.name = frappe.db.get_value(arg1, arg2, "name")
					if self.name is None:
						frappe.throw(_("{0} {1} not found").format(_(arg1), arg2), frappe.DoesNotExistError)
				else:
					self.name = arg2

			self.load_from_db()

		elif isinstance(arg1, dict):
			super(Document, self).__init__(arg1)
			self.init_valid_columns()

		else:
			# incorrect arguments. let's not proceed.
			raise frappe.DataError("Document({0}, {1})".format(arg1, arg2))
Constructor.
dataset/ETHPy150Open frappe/frappe/frappe/model/document.py/Document.__init__