Pass expression to manipulate local variable

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According to an answer in another thread

eval always happens at global scope

So the question remains: how to pass an Expr to work on local scope?

Metaprogramming & variable scope

I have some function as such: function somefunction(df::AbstractDataFrame, indexcols::Array{Symbol,1}) ... dummydf = similar(df,0) for col in indexcols dummydf[col] = [] @eval $col = unique(df[$(QuoteNode(col))]) end ... return dummydf end For the @eval statement in the for loop, it’s telling me that df is not defined. I’m guessing that it’s looking for df within the scope of the eval statement. I tried wrapping the df in QuoteNode, but that didn’t work either.…