> ... But the ticket attritbutes weren't copied, only the references to them.
>   I tried but deepcopy() but that gives:
>
>    File "build/bdist.linux-x86_64/egg/tracjsgantt/tracjsgantt.py", line
> 558, in _add_tasks
>      self.pm.computeSchedule(options, self.tickets)
>    File "build/bdist.linux-x86_64/egg/tracjsgantt/tracpm.py", line 566,
> in computeSchedule
>      ticketsByID[t['id']] = copy.deepcopy(t)
>    File "/usr/lib/python2.6/copy.py", line 162, in deepcopy
>      y = copier(x, memo)
>    File "/usr/lib/python2.6/copy.py", line 255, in _deepcopy_dict
>      y[deepcopy(key, memo)] = deepcopy(value, memo)
>    File "/usr/lib/python2.6/copy.py", line 189, in deepcopy
>      y = _reconstruct(x, rv, 1, memo)
>    File "/usr/lib/python2.6/copy.py", line 322, in _reconstruct
>      args = deepcopy(args, memo)
>    File "/usr/lib/python2.6/copy.py", line 162, in deepcopy
>      y = copier(x, memo)
>    File "/usr/lib/python2.6/copy.py", line 235, in _deepcopy_tuple
>      y.append(deepcopy(a, memo))
>    File "/usr/lib/python2.6/copy.py", line 189, in deepcopy
>      y = _reconstruct(x, rv, 1, memo)
>    File "/usr/lib/python2.6/copy.py", line 323, in _reconstruct
>      y = callable(*args)
>    TypeError: __init__() takes exactly 3 arguments (1 given)
> ...

http://grokbase.com/p/python.org/python-list/2009/01/how-to-deepcopy-a-list-of-user-defined-lists/08o7x4coflamidhtsvod2ewoluna
notes:

 A subclass of list should populate the list in __init__, not __new__,
usually by calling list.__init__, as lists are mutable and subclasses
thereof should be too.

I don't believe TracPM has any subclass of list and I think Ticket
maybe which suggests to me there's something wrong in Trac core.  With
a little support, I'll work on the patch but core is unfamiliar to me.

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