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@rename does not work with special symbols #258
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Just came across this.
It's tedious to work with long (multi-word) collumn-headers that might come from reading in a csv file.
Is there any workaround?Is there a good workaround?
After looking at the namedtuple.jl docstrings, the best I found so far is the following:
df |> @map((; Symbol("Cool name")=>_.bat, _.bar)) # One direction df |> @map((bat = _[Symbol("Cool name")],_.bar)) # Can be a bit simpler in the other direction
It's not pretty, and one has to explicitly list all the columns that one wants to keep.
It also feels really strange that
df |> @rename(:bar => :a)works, butdf |> @rename(:bar => Symbol("a"))fails with a strange error message.ERROR: MethodError: no method matching getindex(::Nothing, ::Int64) Stacktrace: [1] @rename(::LineNumberNode, ::Module, ::Vararg{Any,N} where N) at /home/ilyagr/.julia/packages/Query/85Sw7/src/table_query_macros.jl:149 [2] include_string(::Function, ::Module, ::String, ::String) at ./loading.jl:1088P.S. My use-case is not actually that I have spaces in the name, but rather that I'd like to use
Symbol("best_$x")wherexis a variable.Reacted by Tom Torsney-WeirI think this also affects
@select. There, the best workaround I could find was@select(startswith('Cool name')).I thought
@select(==('Cool name'))should work, but it doesn't, reportingERROR: MethodError: no method matching zero(::Type{Any}).
Due to the way
@renamesearches for column names, it is impossible to rename from/to names which have special characters in them. E.g.@rename(Symbol("#abc def.") => :newname)does not work.