<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def create_shipping_address(self, shipping_address):
 """Creates a shipping address on an existing account. If you are creating an account, you can embed the shipping addresses with the request"""

        url = urljoin(self._url, '/shipping_addresses')
        return shipping_address.post(url)