<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_user(self, username, password, name, email):
 """Create a sub account."""

        method = 'POST'
        endpoint = '/rest/v1/users/{}'.format(self.client.sauce_username)
        body = json.dumps({'username': username, 'password': password,
                           'name': name, 'email': email, })
        return self.client.request(method, endpoint, body)