# The Python MasterConnection Class

> The MasterConnection class extends the Connection class for HA applications.

> setQuorum(quorum) | Set the number of active replicas that is acceptable (including 0) at runtime. Example:
>         cmaster_con = exdb.MasterConnection(db)
>         params = exdb.MasterConnectionParameters()
>         params.modeFlags = exdb.MCO_MASTER_MODE
>         params.quorum = 1 # set initial value for HA quorum
>         master_con.setReplicationMode(params)
>         ...

>         master_con.setQuorum(1) # change HA quorum at runtime