How to use the pyopencga.opencga_client.OpenCGAClient function in pyopencga

def test_sid_generation(self):
        open_cga_client = OpenCGAClient(self.configuration, user='pepe', pwd='pepe')
        expect(open_cga_client.session_id).to.equal('XOkCfKX09FV0YyPJCBvd')
        open_cga_client = OpenCGAClient(self.configuration, session_id='XOkCfKX09FV0YyPJCBvd')
        expect(open_cga_client.session_id).to.equal('XOkCfKX09FV0YyPJCBvd')
        open_cga_client.projects.info('pt')
        expect(httpretty.last_request()).to.have.property(
            "headers").which.have.property('headers').which.should.equal(['Host: mock-opencga\r\n',
                                                                          'Connection: keep-alive\r\n',
                                                                          'Accept-Encoding: gzip\r\n',
                                                                          'Accept: */*\r\n',
                                                                          'User-Agent: python-requests/2.17.3\r\n',
                                                                          'Authorization: Bearer XOkCfKX09FV0YyPJCBvd\r\n']
                                                                         )

def test_pagination(self):
        open_cga_client = OpenCGAClient(self.configuration, session_id='XOkCfKX09FV0YyPJCBvd')
        r = open_cga_client.files.search(study='st')
        expect(len(r.get())).equal_to(10000)
        r = open_cga_client.files.search(study='st', limit=500)
        expect(len(r.get())).equal_to(500)
        for batch in open_cga_client.analysis_variant.query(5001, data={}):
            expect(len(batch.get())).lower_than_or_equal_to(5001)

def test_sid_generation(self):
        open_cga_client = OpenCGAClient(self.configuration, user='pepe', pwd='pepe')
        expect(open_cga_client.session_id).to.equal('XOkCfKX09FV0YyPJCBvd')
        open_cga_client = OpenCGAClient(self.configuration, session_id='XOkCfKX09FV0YyPJCBvd')
        expect(open_cga_client.session_id).to.equal('XOkCfKX09FV0YyPJCBvd')
        open_cga_client.projects.info('pt')
        expect(httpretty.last_request()).to.have.property(
            "headers").which.have.property('headers').which.should.equal(['Host: mock-opencga\r\n',
                                                                          'Connection: keep-alive\r\n',
                                                                          'Accept-Encoding: gzip\r\n',
                                                                          'Accept: */*\r\n',
                                                                          'User-Agent: python-requests/2.17.3\r\n',
                                                                          'Authorization: Bearer XOkCfKX09FV0YyPJCBvd\r\n']
                                                                         )

def test_extra_parameters(self):
        open_cga_client = OpenCGAClient(self.configuration, session_id='XOkCfKX09FV0YyPJCBvd')
        open_cga_client.projects.info('pt', extra='as_argument', **{'extra2': 'as_kwargs'})
        expect(httpretty.last_request()).to.have.property(
            "querystring").which.should.have.key('extra').which.should.equal(['as_argument'])
        expect(httpretty.last_request()).to.have.property(
            "querystring").which.should.have.key('extra2').which.should.equal(['as_kwargs'])

def create_session_file(configuration, opencga_dir):
        fdw = open(os.path.join(opencga_dir, 'session_python.json'), 'w')
        user = raw_input("User: ")
        pwd = getpass.getpass()
        o = OpenCGAClient(configuration=configuration, user=user, pwd=pwd)
        session = {'userId': user, 'sessionId': o.session_id}
        json.dump(session, fdw)
        fdw.close()
        sid = session['sessionId']
        return sid