Selecting DataFrame columns with Symbol Syntax for columns with non-alphabetical characters

General Usage
7

In DataFramesMeta you can use $ to work with column names generated by code (which includes simple string values). See the documentation here.

Example:

using DataFramesMeta

df = DataFrame(:Firstcolumn => 1:5, Symbol("Second-column") => 1:5)

@transform(df, $"Second-column" = $"Second-column" .+ 1)

5×2 DataFrame
 Row │ Firstcolumn  Second-column 
     │ Int64        Int64         
─────┼────────────────────────────
   1 │           1              2
   2 │           2              3
   3 │           3              4
   4 │           4              5
   5 │           5              6
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