Tristate 8 bit bi-directional

Hello All
I came across Josy Boelen simpletristateexample.py.

Josy code works great. 

I started from his code and created mul_ts.py
https://gist.github.com/441d86f67d3fdac12d53d1f93e44fcea.git
in hopes of getting to a 8 bit Bi-directional Signal.

I import his simpletristateexample.py
https://gist.github.com/c816d585e12ae397627b.git

My code converts and I can simulate with the
following cmds python mul_ts.py --convert &
python mul_ts.py --trace

When I uncoment lines 73-75 my code.
        '''
        @always_comb
        def rtl2():
            t_rpi2B.next = concat(ts7,ts6,ts5,ts4,ts3,ts2,ts1,ts0)
        ''' 

My code will not convert or trace.
This is the error that I get.
    t_rpi2B.next = concat(ts7,ts6,ts5,ts4,ts3,ts2,ts1,ts0)
  File "/usr/local/lib/python2.7/dist-packages/myhdl-1.0dev-py2.7.egg/myhdl/_concat.py", line 79, in concat
    val = val << w | v & (long(1) << w)-1
TypeError: unsupported operand type(s) for <<: 'NoneType' and 'int'

I have also tried which converts but will not trace
        @always_comb
        def rtl2():
            t_rpi2B.next = ts7*128+ts6*64+ts5*32+ts4*16+ts3*8+ts2*4+ts1*2+ts0
With this error
    t_rpi2B.next = ts7*128+ts6*64+ts5*32+ts4*16+ts3*8+ts2*4+ts1*2+ts0
  File "/usr/local/lib/python2.7/dist-packages/myhdl-1.0dev-py2.7.egg/myhdl/_Signal.py", line 379, in __mul__
    return self._val * other
TypeError: unsupported operand type(s) for *: 'NoneType' and 'int'
 
My issue is that I can not combine the 8 tristate signals
to a bus.
I appreciate any help. Edward Vidal Jr. e-mail [email protected] 915-595-1613

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