str object has no attribute 'update'

[Saravanakumar Natarajan]

I am getting AttributeError 'str' object has no attribute 'update'

Exception location. /usr/local/lib/python3.4/site-packages/Pyomo-4.2.10784-py3.4.egg/pyomo/opt/base/solvers.py in solve, Line 530

Python version 3.4.0

tmp_solver_options = kwds.pop('options', {})
530         tmp_solver_options.update(
531             self._options_string_to_dict(kwds.pop('options_string', '')))

[Gabriel Hackebeil]

Looks like you are assigning the options keyword a string, when it should be assigned a dictionary. The options_string keyword is probably what you are looking for. Example:

opt.solve(model, options={‘threads: 1}, options_string=“mipgap=0.2”)

Gabe

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