<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_firewalls(self):
 """Returns a list of all firewalls on the account. :returns: A list of firewalls on the current account. """


        mask = ('firewallNetworkComponents,'
                'networkVlanFirewall,'
                'dedicatedFirewallFlag,'
                'firewallGuestNetworkComponents,'
                'firewallInterfaces,'
                'firewallRules,'
                'highAvailabilityFirewallFlag')

        return [firewall
                for firewall in self.account.getNetworkVlans(mask=mask)
                if has_firewall(firewall)]