We consider it to be best practice to cleanly separate the parameters of a model from the model itself. At the least, parameters should be defined in a separate section at the start of a file. Ideally, they should be defined in a separate file entirely. This makes version control easier, since the model code typically changes less often than the parameters, and makes it easier to track a simulation project, since the parameter sets can be stored in a database, displayed in a GUI, etc.
The Parameters package provides Python classes to make it easier to work with parameter sets for complex models. In particular it provides tools for
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Parameters was previously part of the NeuroTools package, but is now developed and distributed separately.