def retrieve(self, id) :
_, _, lead = self.http_client.get("<STR_LIT>".format(id=id))<EOL>return lead<EOL>
Retrieve a single lead

Returns a single lead available to the user, according to the unique lead ID provided
If the specified lead does not exist, this query returns an error

:calls: ``get /leads/{id}``
:param int id: Unique identifier of a Lead.
:return: Dictionary that support attriubte-style access and represent Lead resource.
:rtype: dict