Error message (8) #255
Description
With the last line of following code a new parameter name shall be created - based on a dictionary:
"keyParam" : "A",
"dictParam" : {"A" : 1},
"listParam" : ["A", "B"],
"${dictParam}" : 5
A dictionary cannot be used as name. Therefore I get the following error message:
Error: 'Found expression '${dictParam}' with at least one parameter of composite data type ('${dictParam}' is of type <class 'dict'>).
Because of this expression is the name of a parameter, only simple data types are allowed to be substituted inside.'!
This is correct.
Now I want to overwrite a key value of this dictionary. But by mistake I use the listParam instead of the keyParam.
${dictParam}[${listParam}] : 5
A list cannot be used as key name. Therefore also in this case an error message is expected. The error is:
Error: 'Found expression '${listParam}' with at least one parameter of composite data type ('${listParam}' is of type <class 'list'>).
Because of this expression is the name of a parameter, only simple data types are allowed to be substituted inside.'!
This is not completely wrong, but misleading. It's the same error message, but a complete different use case.
The error message belongs to a dollar operator expression, encapsulated in quotes, that would - if placed on the left hand side of the colon - create a new parameter name dynamically.
This error does not fit to the second code example. In second case I suggest to use the original error message from Python interpreter:
TypeError: unhashable type: 'list'
Or you provide an own interpretation, something like:
Dictionary keys are expected to be of type str or int.