<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def add_complex(self, **kwargs):
 """ Add a new complex to the rumetr db """

        self.check_developer()
        self.post('developers/%s/complexes/' % self.developer, data=kwargs)