params = {} if params is None else params.copy()
has solved the problem.
I have provided just a toy example here. Execute method actually takes
dict[str, List]. List contains objects. Each object has two properties, so I
have a logic that analyzes these properties and returns None or List as a
dict[k] value.
Now when I have dict prepared with proper key/values pairs, I am proceeding to
execution of the jinjasql query.
What I have to ensure is that I will get dic[str, List] (I could go further and
ensure that list contains only object of certain class, by the way, how to do
that?).
Than I must ensure that I am working on local copy of parameters.
Anyway, copy that Dieter Maurer suggested works as it should.
Thanks.
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