def sendeprt(self, host, port):
'''Send a EPRT command with the current host and the given port number.'''
af = 0
if self.af == socket.AF_INET:
af = 1
if self.af == socket.AF_INET6:
af = 2
if af == 0:
raise error_proto, 'unsupported address family'
fields = ['', repr(af), host, repr(port), '']
cmd = 'EPRT ' + '|'.join(fields)
return self.voidcmd(cmd)
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