I was wondering if there were some kind of estimated time horizon on this. Is 
it just a bug fix with a few hours if work, or is it a new feature that would 
have to be added, potentially taking a few weeks? I'll need to work around the 
problem, if that's the case. 




N

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On Tue, Oct 8, 2013 at 12:54 AM, F. B. <franz.bona...@gmail.com> wrote:

> /sympy/tensor/index_methods.pyc
> I have never worked on this file. The real tensor module is 
> /sympy/tensor/tensor.py, the other files in that directory are tools for 
> code generation (I think), which are able to handle indexed data, but I 
> never used them.
> On Tuesday, October 8, 2013 8:20:31 AM UTC+2, Ondřej Čertík wrote:
>>
>> Nathan, 
>>
>> On Mon, Oct 7, 2013 at 10:52 PM, Nathan Woods 
>> <charle...@gmail.com<javascript:>> 
>> wrote: 
>> > The sympy function (the output of printing the expression) is: 
>> > "t*x*y + x**2 + y**2 + Piecewise((0, x < 0.5), (1, x >= 0.5)) + cos(t) - 
>> 1" 
>> > 
>> > The error message is: 
>> > 
>> > TypeError: unsupported operand type(s) for |=: 'set' and 'Piecewise' 
>> > 
>> > 
>> > The whole error output is: 
>> > 
>> > Traceback (most recent call last): 
>> >   File "integration.py", line 201, in <module> 
>> >     print IntegrableFunction(integrands[0],**test).integrate() 
>> >   File "integration.py", line 52, in __init__ 
>> >     sympy_function,self.sympy_variables,args=self.args) 
>> >   File "integration.py", line 167, in __init__ 
>> >     argument_sequence=self.sympy_variables,to_files=True) 
>> >   File 
>> > 
>> "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>  
>>
>> > line 958, in codegen 
>> >     return code_gen.write(routines, prefix, to_files, header, empty) 
>> >   File 
>> > 
>> "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>  
>>
>> > line 445, in write 
>> >     dump_fn(self, routines, f, prefix, header, empty) 
>> >   File 
>> > 
>> "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>  
>>
>> > line 615, in dump_c 
>> >     self.dump_code(routines, f, prefix, header, empty) 
>> >   File 
>> > 
>> "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>  
>>
>> > line 489, in dump_code 
>> >     code_lines.extend(self._call_printer(routine)) 
>> >   File 
>> > 
>> "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/utilities/codegen.py",
>>  
>>
>> > line 593, in _call_printer 
>> >     constants, not_c, c_expr = ccode(result.expr, assign_to=assign_to, 
>> > human=False) 
>> >   File 
>> > 
>> "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/printing/ccode.py",
>>  
>>
>> > line 262, in ccode 
>> >     return CCodePrinter(settings).doprint(expr, assign_to) 
>> >   File 
>> > 
>> "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/printing/ccode.py",
>>  
>>
>> > line 87, in doprint 
>> >     code0 = self._doprint_a_piece(expr, assign_to) 
>> >   File 
>> > 
>> "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/printing/codeprinter.py",
>>  
>>
>> > line 30, in _doprint_a_piece 
>> >     d = get_contraction_structure(expr) 
>> >   File 
>> > 
>> "/Users/woodscn/SCIPYTEST/lib/python2.7/site-packages/sympy/tensor/index_methods.py",
>>  
>>
>> > line 401, in get_contraction_structure 
>> >     result[key] |= d[key] 
>> > TypeError: unsupported operand type(s) for |=: 'set' and 'Piecewise' 
>>
>>
>> I see, here is how to reproduce it: https://gist.github.com/certik/6880300 
>>
>> This is definitely a bug. Franz, any idea why it would call the tensor 
>> module? 
>>
>> Ondrej 
>>
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